Question: solve for all values of x on the given intervals (please show work!) 13. 3cos2 = cosy+ cos2 y; 15. 7sec2 x+l x; 14. 2sin2A+7sinA+3=O;

solve for all values of x on the given intervals (please show work!)

13. 3cos2 = cosy+ cos2 y; 15. 7sec2 x+l x; 14. 2sin2A+7sinA+3=O;

13. 3cos2 = cosy+ cos2 y; 15. 7sec2 x+l x; 14. 2sin2A+7sinA+3=O; 16. 4sin4 a7sin2 a = -3; 2 317 2 377 2

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