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How do you evaluate $sin (225)$ ?

1 Answer

Shwetank Mauria

Nov 2, 2016

$sin225^@=-1/sqrt2$

Explanation:

$sin225^@=sin(180^@+45^@)$

As $sin(180^@+A)=-sinA$

$sin225^@=-sin45^@=-1/sqrt2$

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