Question

Cosec 36 x Cos 64 ...??​

Answer 1

here cos64=sin(90-64)

therefore sin(90-64) becomes sin36

cosec36 becomes 1/sin36

this implies

1/sin36*sin36=1

I hope it is a correct answer

Answer 2

Answer:

Cosec 36° × Cos 64°

As we know Cos A = sin (90°-A)

Cos 64° = sin(90°-64°) = sin36°

Cos64° = sin36°

According to question

Cosec 36° × sin 36°

= CosecA = 1/sinA

Cosec 36° = 1/sin 36°

Sin36°/ sin36°

= 1

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