Cos square 51 + theta + cos square 39 - theta
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if yes,
cos square 51 + ● + cos square 39 - ●
● gets canceled,
cos square 51 + cos square 39
cos square 51 + sin square 51
=1
if yes,
cos square 51 + ● + cos square 39 - ●
● gets canceled,
cos square 51 + cos square 39
cos square 51 + sin square 51
=1
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