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prove:(cscx-cotx)^4 x (cscx+cotx)^4 = 1

1 answer

LS
= [(cscx - cotx)(cscx + cotx)]^4
= [csc^2x - cot^2x]^4
= [1 + cot^2x - cot^2x]^4
= [1]^4
= 1
= RS
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