Question

Cosec A = root 10, A+B=90. Find cos B.

Answer 1

Answer:

A + B = 90°

=> A = 90° - B

cosec A = √10

cosec( 90° - B ) = √10 [ { cosec ( 90° - θ ) = sec θ } ]

sec B = √10 [ sec θ = 1/cosθ ]

cos B = 1 / √10