Additional Mathematics 0606 / Trigonometry / 3.653.65: Rationalising a surd expression0606/21/O/N/21 — Question 4 · 5 marksMark as done · Save for later · Show all solutionsFind rational values of aaa and bbb such that 15+2+15−2=a+b5\dfrac{1}{\sqrt{5}+2} + \dfrac{1}{\sqrt{5}-2} = a + b\sqrt{5}5+21+5−21=a+b5.[5]▸ Answer▸ Official mark scheme← 3.64: Horizontal tangents to a sine curve3.66: Derivative of tan squared →
