# If #\sin x = \frac { 4} { 5]#, what is #sin 2x#?

##### 2 Answers

May 21, 2018

i got

#### Explanation:

We have

so we get

May 22, 2018

#### Explanation:

Since

If x lies in Q. 1 --> 2x lies in Q. 2 --> sin 2x is positive

If x lies in Q. 2 --> 2x lies in Q. 3 --> sin 2x is negative.