Math  /  Trigonometry

QuestionSuppose that tanα=34,cosα<0\tan \alpha=\frac{3}{4}, \cos \alpha<0 and cosβ=13,3π2<β<2π\cos \beta=\frac{1}{3}, \frac{3 \pi}{2}<\beta<2 \pi.
Find cos(2α)\cos (2 \alpha)

Studdy Solution
cos(2α)=725\cos(2\alpha) = \frac{7}{25}

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