Related formulas

Prove the trigonometric identity $\sec\left(x\right)=\frac{\sin\left(2x\right)}{\sin\left(x\right)}-\left(\frac{\cos\left(2x\right)}{\cos\left(x\right)}\right)$

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Trigonometric Identities

· Pythagorean identity of sine and cosine

Applying the pythagorean identity: $\sin^2\left(\theta\right)+\cos^2\left(\theta\right)=1$

$\sin\left(x\right)^2+\cos\left(x\right)^2=1$
$\sec\left(x\right)=\frac{\sin\left(2x\right)}{\sin\left(x\right)}-\frac{\cos\left(2x\right)}{\cos\left(x\right)}$

Related formulas:

1. See formulas

Time to solve it:

~ 0.1 s (SnapXam)