Inverse Trigonometric FunctionHard

Question

For the equation 2x = tan (2tan-1a) + 2tan(tan-1a + tan-1a3), which of the following is / are invalid ?

Options

A.a2x + 2a = x
B.a2 + 2ax + 1 = 0
C.a ≠ 0
D.a ≠ -1, 1

Solution

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