Question

If A and B are acute angles and sinA = sinB .prove A+B=90.​

Answer 1

if there is cosB in place of sin B then ..

it is given that sinA=cos B

where A and B are acute angles.

,

now,

proof-

sinA= cosB

sinA= sin(90-B)

A= 90-B

A+B =90

hence proved