sinpower2+cospower2=1 then find tan power2
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sin^2+cos^2=1
divide this whole by cos^2
=>tan^2+1=1/cos^2
=>tan^2+1=sec^2
=>tan^2=sec^2-1
divide this whole by cos^2
=>tan^2+1=1/cos^2
=>tan^2+1=sec^2
=>tan^2=sec^2-1
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