Mathematical Equations Posted on April 23, 2026June 20, 2026 by admin Solve x² − 9x + 20 = 0. x² − 9x + 20 = 0 x=−b±b2−4ac2ax=\frac{-b\pm\sqrt{b^2-4ac}}{2a} d=(x2−x1)2+(y2−y1)2d=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2} Obtained MarksTotal Marks×100\frac{\text{Obtained Marks}}{\text{Total Marks}}\times100 SI=PRT100SI=\frac{PRT}{100} A=P(1+R100)TA=P\left(1+\frac{R}{100}\right)^T A=πr2A=\pi r^2 ∑i=110i\sum_{i=1}^{10} i P(E)=Favourable OutcomesTotal OutcomesP(E)=\frac{\text{Favourable Outcomes}}{\text{Total Outcomes}} sin2θ+cos2θ=1\sin^2\theta+\cos^2\theta=1 tanθ=sinθcosθ\tan\theta=\frac{\sin\theta}{\cos\theta}