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17-02-2022
Mathematics

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Prove that : sin 25° . sec 65° = 1

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XxMassomestbacchixX XxMassomestbacchixX

17-02-2022

Answer:

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

cos65° \times \frac{1}{cos65°} = 1 \\ 1 = 1[/tex]

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