sec⁴-tan⁴=sec²+tan²
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Answer:
tan⁴x+tan²x
=(tan²x)²+(sec²x-1)[°.° tan²x=sec²x-1]
= (sec²x-1)²+(sec²x-1)
= sec⁴x+1-2 sec²x+sec²x-1
=> se⁴x-sec²x
Hence proved
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