જો $\cos^{-1}\left(\frac{x}{a}\right) + \cos^{-1}\left(\frac{y}{b}\right) = \alpha$ હોય,તો $\frac{x^2}{a^2} - \frac{2xy}{ab}\cos \alpha + \frac{y^2}{b^2} = $

જો $4 \sin ^{-1} x + \cos ^{-1} x = \pi$ હોય,તો $x = $

જો $3 \tan^{-1} x + \cot^{-1} x = \pi$ હોય,તો $x$ ની કિંમત શોધો.

જો $0 \leq x \leq \frac{1}{2}$ હોય,તો $\tan \left[\sin ^{-1}\left\{\frac{x}{\sqrt{2}}+\frac{\sqrt{1-x^{2}}}{\sqrt{2}}\right\}-\sin ^{-1} x\right]$ ની કિંમત શોધો.

જો $\frac{\sin ^{-1} x}{a}=\frac{\cos ^{-1} x}{b}=\frac{\tan ^{-1} y}{c}$ અને $0 < x < 1$ હોય,તો $\cos \left(\frac{\pi c}{a + b}\right)$ ની કિંમત શોધો.

કિંમત શોધો: $\tan ^{ - 1}\left(\frac{{{c_1}x - y}}{{{c_1}y + x}}\right) + \tan ^{ - 1}\left(\frac{{{c_2} - {c_1}}}{{1 + {c_2}{c_1}}}\right) + \tan ^{ - 1}\left(\frac{{{c_3} - {c_2}}}{{1 + {c_3}{c_2}}}\right) + ... + \tan ^{ - 1}\left(\frac{1}{{{c_n}}}\right)$