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OpenStudy (anonymous):
how does tan^4(x)=tan^2(x)sec^2(x)-tan^2(x)
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OpenStudy (anonymous):
use the properties of trig functions sec2-1=tan^2 *right side* factor out tan^2 to get tan^2(sec^2-1)=tan^2tan^2 tan^4=tan^4
OpenStudy (anonymous):
should be sec^2-1=tan^2 not sec2-1=tan^2
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