Question

Find the values of the trigonometric functions if: $\cos \theta =\frac{4}{5},\frac{3\pi }{2}<\theta <2\pi$.

Answer 1

$cos\theta \frac{4}{5}$ forth quad cos +ve

$tan\theta =\frac{-3}{4}$ $sin\theta =\frac{-3}{5}$

$cot\theta =\frac{-4}{3}$ $cosec\theta =\frac{-5}{3},sec\theta =\frac{5}{4}$