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(Solved): TRIGONOMETRIC FUNCTIONS OF SUMS AND DIFFERENCES of TWO ANGLES 10. If \( 0 \leq x, y \leq \frac{\pi}{ ...
TRIGONOMETRIC FUNCTIONS OF SUMS AND DIFFERENCES of TWO ANGLES
10. If \( 0 \leq x, y \leq \frac{\pi}{2} \) and \( \sin x=\frac{4}{5}, \sin y=\frac{5}{13} \), find the value of: (a) \( \cos x \) (b) \( \cos y \) (c) \( \cos (x+y) \) (d) \( \sin (x-y) \)