If $\sin x=\sin y$ and $\cos x=\cos y$, then the value of $x-y$ is
- A. $\pi/4$
- B. $n\pi/2$
- C. $n\pi$
- D. $2n\pi$
✅ Correct Answer: $2n\pi$
Explanation
$\cos(x-y)=\cos x\cos y+\sin x\sin y$ $=\cos^2 x+\sin^2 x$ $=1$ So $x-y=2n\pi$
🎯 Happy Preparation — ACME Academy
