public function rotate($angle) 
    {
        $sin = sin($angle);
        $cos = cos($angle);
        return $this->multiply($cos, $sin, -$sin, $cos, 0, 0);
    }
public function rotate($angle) 
    {
        $sin = sin($angle);
        $cos = cos($angle);
        return $this->multiply($cos, $sin, -$sin, $cos, 0, 0);
    }
public function rotate ( $ angle ) { $ sin = sin ( $ angle ) ; $ cos = cos ( $ angle ) ; return $ this -> multiply ( $ cos , $ sin , - $ sin , $ cos , 0 , 0 ) ; }
Returns a new matrix based on the current matrix with a rotation
transformation applied.

@param float $angle  Rotation angle in radians.
@return \Jdenticon\Canvas\Matrix
Returns a new matrix based on the current matrix with a rotation transformation applied .