Question

prove that sin 65 + cos 25 in the bracket and in the bracket sin 65 - cos 25 20​

Answer 1

Answer:

(sin 65 + cos 25)(sin 65-cos25)

[sin65+ cos(90-65)]

[sin65-cos(90-65)]

(sin 65 + sin 65)

(sin65-sin 65)

2sin 65

hope it will help you

Answer 2

by cos theta formula we know that sin 90- theta is cos theta

so

sin 65 + cos 25(sin so 90

-25- cos 25)

so sin 65- cos25(0)

so 0