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OpenStudy (anonymous):
sin^4(x)-cos^4(x)=?
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OpenStudy (anonymous):
sin^4 - cos^4= sin^2 - cos^2
OpenStudy (anonymous):
or -cos(2)
OpenStudy (sriram):
=[sin^2x-cos^2x][sin^2x+cos^2x] =-cos(2x)
OpenStudy (anonymous):
ho ho thanks sriram
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