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[" 70."cos^(-1)((3+5cos x)/(5+3cos x))" ...

[" 70."cos^(-1)((3+5cos x)/(5+3cos x))" is equal to "],[[" (a) "tan^(-1)((1)/(2)tan(x)/(2))," (b) "2tan^(-1)(2tan(x)/(2))],[" (c) "(1)/(2)tan^(-1)(2tan(x)/(2))," (d) "2tan^(-1)((1)/(2)tan(x)/(2))],[" (e) "tan^(-1)(tan(x)/(2)),]]

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