Math, asked by adityaroy7005, 9 months ago

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Answered by Sreesha
1

Answer:

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Step-by-step explanation:

13. cot(90-Ф) = tanФ

   sec²Ф - tan²Ф = 1

14. sin²Ф + cos² Ф = 1

                                   = cosec²Ф - cot²Ф

16. secФ = cosec (90-Ф)               and sinФ = cos (90-Ф)

       The answers reduces to 1.

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