Asked by Laly

Cos D= -3/4. if the sine of the angle is positive, find the sine of the angle and determine the quadrant.
Can anyone tell me the steps. I need to learn this.
Answered by Damon
sin^2 D = 1 - cos^2 D
The sin is + and the cos is - in Quadrant 2
Answered by Laly
Is cos^2D= 9/16
Answered by bobpursley
yes, cosine squared of D is 9/16
Answered by Laly
Soo what is the squareroot of 7/16?
Answered by bobpursley
1/4 sqrt7
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