Question

36) Evaluate, sin 25 cos 65 cos 250 sin 65​

Answer 1

Answer:

I think third term is cos25°. And after 2nd term, it should be + so as to get the answer.

Step-by-step explanation:

sin25°×cos65°+cos25°×sin65°

= sin25°×cos(90°-25°)+cos25°×sin(90°-25°)

=sin25°×sin25°+cos25°×cos25°

=sin²25°+cos²25°

=1                                                                        (Because sin²Ф+cos²Ф=1. Here

                                                                             Ф is 25°)

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