If sin B - cos A = 0, then what is the value of A + B?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 90 degree.
Given: sin B = cos A
But cos A = sin(90 - A)
So, sin B = sin(90 - A)
⇒ B = 90 - A
⇒ A + B = 90