tan E^2 I1 - etan^4 F 1 + e^2
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Start by simplifying the expression inside the tangent function: tan(E-2I1) - tan(4F/(1+e^2)) Show more…
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$$ \sec ^{4} A-\sec ^{2} A=\tan ^{4} A+\tan ^{2} A $$
$$ \tan ^{2} A-\sin ^{2} A=\sin ^{4} A \sec ^{2} A $$
$\left(-a^{2}+b^{2}+c^{2}\right) \tan A=\left(a^{2}-b^{2}+c^{2}\right) \tan B=\left(a^{2}+b^{2}-c^{2}\right) \tan C .$
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