Math, asked by aravindsidda68, 3 months ago

cos36degree cos54degree - sin36degree sin54degree = 0

Answers

Answered by mathdude500

1

cosA cosB - sinA sinB = cos (A + B)

Put A = 54 and B = 36

cos54 cos36 - sin54 sin36 = cos (54 + 36)

= cos90

= 0

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