Question

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Answer 1

Answer:

Find the answer in the attachment.

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Answer 2

Answer:

${ \cos(30) }^{2} - { \sin(30) }^{2} \\ \cos(30) = \frac{ \sqrt{3} }{2} \\ \sin(30 ) = \frac{1}{2} \\ \\ now \\ { (\frac{ \sqrt{3} }{2} )}^{2} - {( \frac{1}{2} )}^{2} \\ = \frac{3}{4} - \frac{1}{4} \\ = \frac{1}{2}$

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