Find the principal value of cosec^(-1)(-...

Find the principal value of `cosec^(-1)(-2)`

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`pi/6`

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Prove that sin^(-1)(3x-4x^3)=3sin^(-1)x,x in[1/2,1]
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tan^(-1)(-1)
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The vlaue of tan^(-1)(1/2)+tan^(-1)(1/3) is
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Prove that cos^(-1)(3x-4x^3)=3cos^(-1)x,x in[1/2,1]
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prove that tan^(-1) (sqrtx)= 1/2 cos^(-1) ((1-x)/(1+x)) , x in [0,1]
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cot^(-1)((sqrt(1+sinx)+sqrt(1-sinx))/(sqrt(1+sinx)-sqrt(1-sinx)))=(x)/...
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