Cos-13-5cos x-5-3cos x is equal to

The correct option is D 2tan^ 1(12tanx2) cosx=1 tan^2(x2)1+tan^2(x2) Substituting in the equation we get cos^ 1(3+3tan^2(x2)+5 5tan^2(x2)5+5tan^2 ...

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Trigonometric Ratios of Multiples of an Angle

cos-13+5cos x...

Question

${cos}^{- 1} (\frac{3 + 5 cos x}{5 + 3 cos x})$ is equal to

{tan}^{- 1} (\frac{1}{2} tan \frac{x}{2})

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t a n^{- 1} (t a n \frac{x}{2})

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\frac{1}{2} t a n^{- 1} (2 t a n \frac{x}{2})

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2 {tan}^{- 1} (\frac{1}{2} tan \frac{x}{2})

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