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OpenStudy (anonymous):
Which one of the following expressions equals 1? sin(x) + cos(x) sin2 (x) + cos2 (x) sin2 (x) – cos2 (x) sin(x) – cos(x)
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OpenStudy (mathstudent55):
There is a famous trig identity that you need to memorize: sin^2(x) + cos^2(x) = 1
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