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anjelica318

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1. (1-sin²B)/(sin²Bcos²B)= csc²B-sec²B--that's really the given. please help.
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how do i verify these?1-sin^2B 1. ----------- = csc^2B-sec^2B sin^2Bcos^B 2. cos(2a+a) = 4cos^3a-3cosa
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