A2 June 2025 Paper 2 Q3

3 Find \(\dfrac{\mathrm{d}}{\mathrm{d}x}\left(\sin^{-1} x - 2\cos^{-1} x\right)\)

Circle your answer. [1 mark]

• \(\dfrac{-3}{\sqrt{1 - x^2}}\)
• \(\dfrac{-1}{\sqrt{1 - x^2}}\)
• \(\dfrac{1}{\sqrt{1 - x^2}}\)
• \(\dfrac{3}{\sqrt{1 - x^2}}\)