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Maclaurin series to provide proof

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Please help me with step by step solutions to the following problems.

1a. Prove

tan^-1 x + tan^-1 y = tan^-1 ((x+y)/(1-xy))

where -PI/2 < tan^-1 x + tan^-1 y < PI/2 .

Hint: Use an identity for tan(x+y).

1b. Use part (a) to show that

tan^-1 (1/2) + tan^-1 (1/3) = PI/4 .

1c. Use the first four terms of the Maclaurin series of tan^-1 x and part (b) to approximate the value of PI.

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Use the first four terms of the Maclaurin series of tan^-1 x and part (b) to approximate the value of PI.

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