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Find all the values of heta in the range 0 eq heta eq 2 au for which au au heta + au au 3 heta = au heta + au heta 2 heta.

Mathematics

ScanSolve AI Answer

Here's how to solve each part of the question:

8.(i) Find all the values of θ\theta in the range 0≤θ≤2π0 \le \theta \le 2\pi for which sin⁡θ+sin⁡3θ=cos⁡θ+cos⁡2θ\sin \theta + \sin 3\theta = \cos \theta + \cos 2\theta.

Step 1: Apply sum-to-product identities to both sides of the equation.
The sum-to-product identities are:
sin⁡A+sin⁡B=2sin⁡(A+B2)cos⁡(A−B2)\sin A + \sin B = 2\sin\left(\frac{A+B}{2}\right)\cos\left(\frac{A-B}{2}\right)
$\cos A + \cos B = 2\cos\left(\frac{A+B}{2

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