The correct option is D 12 According to question, cos120^o=cos(90^o+30^o) sin30^o 12 ...

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Integration Using Substitution

cos120o=-12.

Question

$cos 120^{o} = \frac{- 1}{2}$ .

- \frac{5}{2}

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- \frac{3}{2}

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\frac{1}{2}

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- \frac{1}{2}

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Solution

The correct option is D $- \frac{1}{2}$
According to question,

$c o s 120^{o} = c o s (90^{o} + 30^{o})$

$⟹ - s i n 30^{o}$

$⟹ - \frac{1}{2}$

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