Question

If A+B=90
and Cos B = 3
then find SinA​

Answer 1

hope it helps you.............

Answer 2

$answer$

As we know that Cos(x)=Base/hypotenuse

then According to the given question if you want to make its diagram you will find it as below:

so we have to find Sin A= perpendicular/ hypotenuse

Sin A= 3/√13 (Answer)

Or

As Cos (90° -x)=Sin x

here A+B=90°

B=90° -A

Cos B=3/√13

Cos (90° -A)=3/√13

Sin (A)=3/√13 (Answer)