Question

Cos square 17 - sin square 73 is equal to zero prove it

Answer 1

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Answer 2

Hii friend,

Cos²17 - Sin²73 = 0

LHS = Cos²17 - Sin²73

=>Cos²17 - Sin²73

=>Cos²17 - Sin²(90-17).

=>Cos²17 - Cos²17 [ Sin(90-theta) = Cos theta]

=> 0

Hence,

LHS = RHS = 0


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