Question

0. What is the value of
5 sin 75°sin 77° + 2 cos 13°cos 15°
cos 15° sin 77°
7 sin 81°
cos 90
(a)-1
(b)
(c) 1
(d) 2
(CDS 2009)​

Answer 1

Answer:

it is option b zero bcoz last lo cos 90 undhi kada