Question

sin(B-A) is equal to ?????????? when B= 270 degrees and A is an acute angle.

Answer 1

okay first how many degrees are in an acute angle

Answer 2

90 degrees

Answer 3

okay now plug them in

Answer 4

sin90cos270+cos90sin270

Answer 5

Am I right?

Answer 6

yeah

Answer 7

thats the correct answer?

Answer 8

do you know how to double check?

Answer 9

No

Answer 10

is this homework or an online thing ?

Answer 11

homework

Answer 12

okay, does it say to simplify on the expressions ?

Answer 13

no

Answer 14

but what if i need to ?

Answer 15

sin (270 - A) = -cos A

Since Sin (270 - A) lies in the 3rd Quadrant. In the 3rd Quadrant the value of sin is Negative.