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    Question on proof

    Have a question regarding proofs using results. On the CSSA Trial Paper this year, I got 0/3 for q15 a.v. (The tan^2x +1 = sec^2x) one. I proved the result by subbing the values into RHS and proving RHS = x1 rather than expanding x1 so that x1=RHS Technically though, I answered the question...
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