‹ Back to the paper
If , then prove that .
If $\cos^{-1}\frac{x}{2} + \cos^{-1}\frac{y}{3} = \theta$, then prove that $9x^2 - 12xy\cos\theta + 4y^2 = 36\sin^2\theta$.
Given: $\cos^{-1}\frac{x}{2} + \cos^{-1}\frac{y}{3} = \theta$
To show: $9x^2 - 12xy\cos\theta + 4y^2 = 36\sin^2\theta$
Answer
No answer yet.
From ISC 2020 Mathematics Paper 1, question 3(a).