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How do you evaluate $sin ((-5pi)/2)$ ?

1 Answer

A. S. Adikesavan

Apr 22, 2016

$-1$

Explanation:

Use $sin(-x)=-sinx and sin (2pi+x)=sin x$

Here, $sin(-(5pi)/2)=-sin((5pi)/2)=-sin(2pi + pi/2)=-sin (pi/2)=-1$ .

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