prove the following
tanq/secq+1 = secq-1 /tanq
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Step-by-step explanation:
tanq/secq+1=tanq(secq-1)/(secq+1)(secq-1)
=tanq(secq-1)/sec^2q-1
=tanq(secq-1)/tan^2q
=secq-1/tanq
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