Math, asked by Alina1076, 9 months ago

Sin35° Sin55°-cos35°cos55°

Answers

Answered by narindersysteam

1

Answer:

since cos (a+b) =- (sin a sinb - cos a cos b)

so cos (35+55) = -(sin35 sin 55- cos 35 cos 55)

so = - cos 90= 0

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