Question

What is the value of sin ­7π/4c?

A) ­1/√2 B) 2/√3 C) 1/√2 D) ­2/√3

Answer 1

Answer:-

$\sin( \frac{7\pi}{4} ) = - \frac{1}{ \sqrt{2} }$

Explanation:-

$\sin( \frac{7\pi}{4} ) \\ \sin(2\pi - \frac{\pi}{4} ) \\ - \sin( \frac{\pi}{4} ) \\ - \frac{1}{ \sqrt{2} }$

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