Question

evalute
3 sin 65 + 3 cosec 25 – 2 cos 65 cosec 25    cos 25        sec 65 ​

Answer 1

Answer:

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Step-by-step explanation:

( sec65 ∘sin25 ∘ )+( cosec65 ∘ cos25 ∘ )

=sin25 ∘ cos65 ∘ +cos25 ∘ sin65 ∘

=sin25 ∘ cos(90 ∘ −25 ∘ )+cos25 ∘ sin(90 ∘ −25 ∘ )

=sin25 ∘ sin25 ∘ +cos25 ∘ cos25 ∘

=sin 2 25 ∘ +cos 2 25 ∘

=1