Question

If A + B = 90° and cos B = 3/5
then the value of sin A is ?​

Answer 1

Answer:

cos(90-A) =Sin A = Cos (B)= 3/5

hence, sin A = 3/5

Answer 2

Answer:

3/5

Step-by-step explanation:

A + B= 90

cos B=3/5

so, base B=3 and hypotenuse= 5

therefore, using pythagoras theorem, height= sqrt [25-9]=4

so, cos A=4/5

that is why sin A=3/5