Question

prove that tan2Q-1/cos2Q=-1
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Answer 1

Answer:

$(1-cos²Q)sec²Q= tan²Q.;</p><p></p><p>LHS: (1-cos²Q)sec²Q;</p><p></p><p>=sin²Q*sec²Q; //sin²x = 1 - cos²x.</p><p></p><p>= sin²Q(1/cos²Q); //secx= 1/cosx.</p><p></p><p>=(sinQ/cosQ)²;</p><p></p><p>= tan²Q; //(sinx/cosx)=tanx.</p><p></p><p>=RHS (proved)$

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Answer 2

Answer:

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Step-by-step explanation: