# How do you find the value for #sin2theta#, #cos2theta#, and #tan2theta# and the quadrant in which #2theta# lies given #sintheta=-sqrt10/10# and #theta# is in quadrant IV?

##### 1 Answer

May 28, 2017

1t is in Quadrant 4.

#### Explanation:

Find cos 2t.

2t is in Quadrant 4 because its sin is negative and its cos is positive.