what is the value of cos square 67 degree minus sin square 23 degree
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cos square 65 degree - cos square (90 degree-23 degree)
cos square 65 degree - cos square 67 degree = 0
answer= 0
cos square 65 degree - cos square 67 degree = 0
answer= 0
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so value of cos square 67 degree minus sin square 23 degree is 0
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