Question

Evaluate sin 65° + cos 65°​

Answer 1

cos(90°-65°)+cos 65°

cos25°+cos65°

1/2(2cos25°.65°)

1/2(cos(25°+65°).cos(65°-25°)

=1/2(cos90°.cos40°)

=1/2*1/2.1/2*40/180*π

= 1/4.1/9*22/7

=1/4.22/63

= . ki value kya hoti hai