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PROVE : sin^2(-300°).cos^2 (120)+ cos^2(-240 ).sin^2(390)=1/4​
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13 votes
PROVE :

sin^2(-300°).cos^2 (120)+ cos^2(-240 ).sin^2(390)=1/4​

User Mrc
by
8.1k points

1 Answer

9 votes

Explanation:


\sin {}^(2) ( - 300) \cos {}^(2) (120) + \cos {}^(2) ( - 240) \sin {}^(2) (390) = (1)/(4)


\sin {}^(2) (60) \cos {}^(2) ( {}^{} 120) + \cos {}^(2) (120) \sin {}^(2) (30)


(3)/(4) (1)/(4) + (1)/(4) (1)/(4)


(3)/(16) + (1)/(16) = (4)/(16) = (1)/(4)

User ABHISHEK THEPRA
by
8.2k points
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