Which of the following formula is incorrect?
Posted: Wed Jul 13, 2022 8:06 pm
a) sin-1x+sin-1y=sin-1{\(x\sqrt{1-y^2}+y\sqrt{1-x^2}\)}
b) sin-1x-sin-1y=sin-1{\(x\sqrt{1+y^2}+y\sqrt{1+x^2}\)}
c) 2 tan-1x=tan-1\((\frac{2x}{1-x^2})\)
d) 2 cos-1x=cos-1(3x-4x3)
b) sin-1x-sin-1y=sin-1{\(x\sqrt{1+y^2}+y\sqrt{1+x^2}\)}
c) 2 tan-1x=tan-1\((\frac{2x}{1-x^2})\)
d) 2 cos-1x=cos-1(3x-4x3)