Asked by Laly
If sin A= -3/5 and angle A is in quadrant IV, find cos A.
I know i have to use the pythagoream identity..but i keep getting stuck.
I know i have to use the pythagoream identity..but i keep getting stuck.
Answers
Answered by
Damon
sin^2 x + cos^2x = 1 do signs for quad 4
9/25 + cos^2 A = 1
cos^2 A = 16/25
cos A = 4/5 or -4/5
so +4/5 because cos is + in quadrant 4
9/25 + cos^2 A = 1
cos^2 A = 16/25
cos A = 4/5 or -4/5
so +4/5 because cos is + in quadrant 4
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