(sec2 theta - 1) (1-cosec2 theta) is equal to?
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Step-by-step explanation:
sec^2 theta-1)(1-cosec^2theta)
=tan^2 theta×(-cot^2 theta)
{since sec^2 theta-1=tan^2 theta and 1-cosec^2 theta= -cot^2 theta}
=tan^2 theta×(-1)/tan^2 theta
= - 1
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