ANGLES IN QUADRANTS

ANGLES IN QUADRANTS
The value of Trigonometric ratios of \((-\theta)\)
  
 Let  be the right angled triangle                         
such that \(\angle OPM = {90^0}\,\,fp = (x,y),\,\,op = r\)
Let \(\angle POM = \theta \) if p is image of p w.r.t x - axis
\(\therefore {p^{ - 1}}(x, - y)\) and \(\angle P'OM = - \theta \) from right angled triangle 
    OMP From right angled triangle OMP-