if cot? + tan? = x and sec? – cos? = y, prove that (x2y)2/3 – (xy2)2/3 = 1.

if cot? + tan? = x and sec? – cos? = y, prove that (x2y)2/3 – (xy2

1.	if cot? + tan? = x and sec? – cos? = y, prove that (x2y)2/3 – (xy2)2/3 = 1.
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