SOLUTION: 7sin(squared)x-3cos(squared)x = 2... please help,a can not solve this...

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Question 760517: 7sin(squared)x-3cos(squared)x = 2...
please help,a can not solve this...
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

7sin%5E2%28x%29-3cos%5E2%28x%29+=+2........cos%5E2%28x%29=1-sin%5E2%28x%29
7sin%5E2%28x%29-3%281-sin%5E2%28x%29%29+=+2
7sin%5E2%28x%29-3%2B3sin%5E2%28x%29+=+2
10sin%5E2%28x%29+=+2%2B3
10sin%5E2%28x%29+=+5
sin%5E2%28x%29+=+5%2F10
sin%5E2%28x%29+=+1%2F2
cos%282x%29=0
x+=+%28pi%2An%29%2F2-pi%2F4, n element Z

+graph%28+600%2C+600%2C+-15%2C+15%2C+-15%2C+15%2C+2%2C+7sin%5E2%28x%29-3cos%5E2%28x%29%29+