Integrating with Trigonometric Identities (AQA A-Level Mathematics): Flashcards

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Integrating with Trigonometric Identities
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3 steps to integrate using trig identities

Simplify w/ identities, apply std integrals, add C

sin⁡2θ+cos⁡2θ≡\sin^2 \theta + \cos^2 \theta \equiv ?

11

tan⁡2θ+1≡\tan^2 \theta + 1 \equiv ?

sec⁡2θ\sec^2 \theta

cos⁡2θ\cos 2\theta in terms of sin⁡2θ\sin^2 \theta

1−2sin⁡2θ1 - 2\sin^2 \theta

sin⁡2θ≡\sin 2\theta \equiv ?

2sin⁡θcos⁡θ2\sin \theta \cos \theta

∫tan⁡2θ dθ\int \tan^2 \theta \, d\theta

tan⁡θ−θ+c\tan \theta - \theta + c

∫tan⁡θ dθ\int \tan \theta \, d\theta

−ln⁡∣cos⁡θ∣+c-\ln |\cos \theta| + c or ln⁡∣sec⁡θ∣+c\ln |\sec \theta| + c

Identity for sin⁡2x\sin^2 x to integrate it

sin⁡2x=12−12cos⁡2x\sin^2 x = \frac{1}{2} - \frac{1}{2}\cos 2x

∫sin⁡2x dx\int \sin^2 x \, dx

12x−14sin⁡(2x)+c\frac{1}{2}x - \frac{1}{4}\sin(2x) + c

∫cos⁡2x dx\int \cos^2 x \, dx

12x+14sin⁡(2x)+c\frac{1}{2}x + \frac{1}{4}\sin(2x) + c

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