Question

If sin x + cosec x = 2, then sin^19 x + cosec^ 20 X =

a. 2^19
b. 2^20
c. 2
d. 2^39
​

Answer 1

Answer:

Ans =(C)

Sin19+cosec20

so according to rule

sin=1/cosec

1/cosec19+cosec20

by rules of division

cosec(-19+20) =2

ans=2