Question

The value of sin5degree +sin 10degree+.....+sin 85degree+sin90degree is ch 8 Ex 8.3Q

Answer 1

Answer:

sin 5° + sin 10° + cos 85° + cos 80° [I think this is the correct question]]

=>sin 5° + sin 10 °+ cos(90°-5°) + cos (90°-10°)

=>sin 5°+sin 10° +sin 5° + sin 10°

=>1+1

=>2

we got 1 because sin 5 and sin 5 got cancel and 1 left same way sin 10 sin 10 got cancel and 1 left and there is the adding sign so we add 1+1=2 and as sin become cos because cos(90-A)=sinA same way sin(90-A) =cosA.

Hope that I am not wrong and this is the answer