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2sec²∅-sec⁴∅-2csc²∅+csc⁴∅
=sec²∅(2-sec²∅)-csc²∅(2-csc²∅)
=(1+tan²∅)(1-tan²∅)-(1+cot²∅)(1-cot²∅)
=1-tan⁴∅-1+cot⁴∅
=cot⁴∅-tan⁴∅
=sec²∅(2-sec²∅)-csc²∅(2-csc²∅)
=(1+tan²∅)(1-tan²∅)-(1+cot²∅)(1-cot²∅)
=1-tan⁴∅-1+cot⁴∅
=cot⁴∅-tan⁴∅
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