if sintheta = 1/3 then find sin2theta and cos2theta.
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The double angles sin(2theta) and cos(2theta) can be rewritten as sin(theta+theta) and cos(theta+theta). Applying the cosine and sine addition formulas, we find that sin(2theta)=2sin(theta)cos(theta
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Sin 2 theta =2sin theta x cos theta. If 180°< theta < 270°, and cos theta = -1/3, what is the value of cos (-theta)
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