Question

Prove that : sin 25° . sec 65° = 1​

Answer 1

Answer:

$sin25° \times sec65° = 1 \\ cos(90° - 25°) \times \frac{1}{cos65°} = 1 \\

cos65° \times \frac{1}{cos65°} = 1 \\ 1 = 1$

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