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Which of the following is/are a rational...

Which of the following is/are a rational number? `sin(tan^(-1)3+tan^(-1)(2/3))` `cos(pi/2-sin^(-1)(3/4))` `(log)_2("sin"(1/4)sin^(-1)(63/8)]` `tan(1/2cos^(-1)(sqrt(5)/3))`

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