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22 September, 10:00

If sin theta 3/5 and theta terminates in the first quadrant find the exact value of cos 2 theta

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  1. 22 September, 13:01
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    i'm gonna use x instead of theta ... since x is in the first quadrant, cosx=4/5 ... (use this is a 3-4-5 triangle) so using the double angle formula: cos2x = cos^2 (x) - sin^2 (x).
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