Question

sin^-1 sin 9π/10 + cos^-1 cos 9π/10​

Answer 1

Answer:

ans π/2

Step-by-step explanation:

Let A=sin −1x as eq. (1) and B=cos −1x as eq. (2).

From (1) and (2) we get,

x=sinA =cosB

or, sinA =sin(90 −B)

or, A= 2π−B

or, A+B=2π

or, sin −1 x+cos −1 x= π/2

Always

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