Question

49. sin (B - A) is equal to .......... when B = 270 degree and A is an acute angle.
(B) cos A
(A)
cos A
(D) sin A
(C) -sin A​

Answer 1

Answer:

- Cos A

Step-by-step explanation:

According to Allied angles it will be equal to

- cos A we have to place a negative sign behind because it lies in quadrant no 3

Answer 2

Answer:

- Cos A

Step-by-step explanation:

sin(B-A)

B=270°

sin(270°-A)

= -Cos A