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solve for x -: tan inverse(x+1) + tan inverse (x-1) = tan inverse (8/31)

    • Posted by Kaviř Ýaduvãnshi 6 years, 3 months ago

    CBSE > Class 12 > Mathematics
    • 1 answers

    Rishabh Rathi 6 years, 3 months ago

    x=1/4 Use arctan a + arctan b = arctan (a+b/1-ab) Compare the terms inside inverse. You will get a quadratic. Reject the answer which is negative since identy used above is for positive and ab<1.

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