(sec0-cos0) (cot0-tan0) = tan0sec0
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(sec2-1/sec)(cot2-1/cot)=(tan2/sec)(cosec2/cot)
=(sin2/cos)(1/sin.cos)
=(sin/cos)(1/cos)
=tan.sec
=(sin2/cos)(1/sin.cos)
=(sin/cos)(1/cos)
=tan.sec
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