diff --git a/libs/main/math/pimathbase.h b/libs/main/math/pimathbase.h
index 0841ac4c..553437f5 100644
--- a/libs/main/math/pimathbase.h
+++ b/libs/main/math/pimathbase.h
@@ -98,9 +98,6 @@ const double rad2deg = M_180_PI;
 inline int sign(const float & x) {return (x < 0.) ? -1 : (x > 0. ? 1 : 0);}
 inline int sign(const double & x) {return (x < 0.) ? -1 : (x > 0. ? 1 : 0);}
 inline int pow2(const int p) {return 1 << p;}
-inline int sqr(const int v) {return v * v;}
-inline float sqr(const float & v) {return v * v;}
-inline double sqr(const double & v) {return v * v;}
 inline double sinc(const double & v) {if (v == 0.) return 1.; double t = M_PI * v; return sin(t) / t;}
 
 PIP_EXPORT double piJ0(const double & v);
@@ -109,22 +106,23 @@ PIP_EXPORT double piJn(int n, const double & v);
 PIP_EXPORT double piY0(const double & v);
 PIP_EXPORT double piY1(const double & v);
 PIP_EXPORT double piYn(int n, const double & v);
-inline double toDb(double val) {return 10. * log10(val);}
-inline double fromDb(double val) {return pow(10., val / 10.);}
-inline double toRad(double deg) {return deg * M_PI_180;}
-inline double toDeg(double rad) {return rad * M_180_PI;}
+
+template <typename T> inline constexpr T toDb(T val) {return T(10.) * std::log10(val);}
+template <typename T> inline constexpr T fromDb(T val) {return std::pow(T(10.), val / T(10.));}
+template <typename T> inline constexpr T toRad(T deg) {return deg * T(M_PI_180);}
+template <typename T> inline constexpr T toDeg(T rad) {return rad * T(M_180_PI);}
+template <typename T> inline constexpr T sqr(const T & v) {return v * v;}
 
 // [-1 ; 1]
 PIP_EXPORT double randomd();
 // [-1 ; 1] normal
 PIP_EXPORT double randomn(double dv = 0., double sv = 1.);
 
-
-inline PIVector<double> abs(const PIVector<double> & v) {
-	PIVector<double> result;
+template<typename T> inline PIVector<T> piAbs(const PIVector<T> & v) {
+	PIVector<T> result;
 	result.resize(v.size());
 	for (uint i = 0; i < v.size(); i++)
-        result[i] = fabs(v[i]);
+		result[i] = piAbs<T>(v[i]);
 	return result;
 }
 
diff --git a/libs/main/math/pimathmatrix.h b/libs/main/math/pimathmatrix.h
index b495d90d..2d9dffd1 100644
--- a/libs/main/math/pimathmatrix.h
+++ b/libs/main/math/pimathmatrix.h
@@ -425,7 +425,7 @@ public:
 				for (uint k = i; k < Cols; ++k) smat.m[k][j] -= mul * smat.m[k][i];
 			}
 			if (i < Cols - 1) {
-				if (fabs(smat.m[i + 1][i + 1]) < Type(1E-200)) {
+				if (piAbs<Type>(smat.m[i + 1][i + 1]) < Type(1E-200)) {
 					if (ok != 0) *ok = false;
 					return *this;
 				}
@@ -469,7 +469,7 @@ public:
 				for (uint k = 0; k < Cols; ++k) mtmp.m[k][j] -= mul * mtmp.m[k][i];
 			}
 			if (i < Cols - 1) {
-				if (fabs(smat.m[i + 1][i + 1]) < Type(1E-200)) {
+				if (piAbs<Type>(smat.m[i + 1][i + 1]) < Type(1E-200)) {
 					if (ok != 0) *ok = false;
 					return *this;
 				}
@@ -513,6 +513,18 @@ public:
 		return tm;
 	}
 
+	_CMatrix rotate(Type angle) {
+		static_assert(Rows == 2 && Cols == 2, "Works only with 2x2 matrix");
+		Type c = std::cos(angle);
+		Type s = std::sin(angle);
+		PIMathMatrixT<2u, 2u> tm;
+		tm[0][0] = tm[1][1] = c;
+		tm[0][1] = -s;
+		tm[1][0] = s;
+		*this = *this * tm;
+		return *this;
+	}
+
 private:
 	Type m[Rows][Cols];
 };
diff --git a/libs/main/math/pimathvector.h b/libs/main/math/pimathvector.h
index a19ae5e3..547b03bb 100644
--- a/libs/main/math/pimathvector.h
+++ b/libs/main/math/pimathvector.h
@@ -69,7 +69,7 @@ public:
 		PIMV_FOR tv += c[i] * c[i];
 		return tv;
 	}
-	Type length() const {return sqrt(lengthSqr());}
+	Type length() const {return std::sqrt(lengthSqr());}
 	Type manhattanLength() const {
 		Type tv(0);
 		PIMV_FOR tv += piAbs<Type>(c[i]);
@@ -82,10 +82,10 @@ public:
 	}
 	Type angleSin(const _CVector & v) const {
 		Type tv = angleCos(v);
-		return sqrt(Type(1) - tv * tv);
+		return std::sqrt(Type(1) - tv * tv);
 	}
-	Type angleRad(const _CVector & v) const {return acos(angleCos(v));}
-	Type angleDeg(const _CVector & v) const {return toDeg(angleRad(v));}
+	Type angleRad(const _CVector & v) const {return std::acos(angleCos(v));}
+	Type angleDeg(const _CVector & v) const {return toDeg<Type>(angleRad(v));}
 	Type angleElevation(const _CVector & v) const {return 90.0 - angleDeg(v - *this);}
 	_CVector projection(const _CVector & v) {
 		Type tv = v.length();
@@ -302,7 +302,7 @@ public:
 		PIMV_FOR tv += c[i] * c[i];
 		return tv;
 	}
-	Type length() const {return sqrt(lengthSqr());}
+	Type length() const {return std::sqrt(lengthSqr());}
 	Type manhattanLength() const {
 		Type tv(0);
 		PIMV_FOR tv += piAbs<Type>(c[i]);
@@ -317,9 +317,9 @@ public:
 	Type angleSin(const _CVector & v) const {
 		assert(c.size() == v.size());
 		Type tv = angleCos(v);
-		return sqrt(Type(1) - tv * tv);
+		return std::sqrt(Type(1) - tv * tv);
 	}
-	Type angleRad(const _CVector & v) const {return acos(angleCos(v));}
+	Type angleRad(const _CVector & v) const {return std::acos(angleCos(v));}
 	Type angleDeg(const _CVector & v) const {return toDeg(angleRad(v));}
 	_CVector projection(const _CVector & v) {
 		assert(c.size() == v.size());
diff --git a/main.cpp b/main.cpp
index 10dfb678..0f49cc37 100644
--- a/main.cpp
+++ b/main.cpp
@@ -45,5 +45,9 @@ int main() {
 	PIMathVectord v2({3,2,1});
 	piCout << v;
 	piCout << v2;
+	PIMathMatrixT22d m = PIMathMatrixT22d::identity();
+	piCout << m;
+	m.rotate(toRad(90.));
+	piCout << m;
 	return 0;
 }