Question

if cos (90 -A ) =0 ,then sin (A+B)​

Answer 1

Answer:

sin B

Step-by-step explanation:

cos (90-A)= 0

sin A= 0

sin A= sin 0⁰

A=0⁰

Now,

sin(A+B)

sinA cosB+ cosA sinB

sin0⁰ cosB+ cos0⁰ sinB

=sinB

[Here sin0⁰=0 and cos0⁰=1]