Math, asked by sagorika7256, 11 months ago

Without using trigonometric table ,prove that ; cos 54° cos 36° - sin 54° sin 36° =0

Answers

Answered by karthik961

2

cos(A+B)=cosAcosB-sinAsinB

hence,

[cos54cos36-sin54sin36]=cos(54+36)=cos90=0

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