Question

Question 1 (ii)
Evaluate the following:
(ii) $2ta{n}^2{45}^{\circ }+co{s}^2{30}^{\circ }-si{n}^2{60}^{\circ }$

Answer 1

(ii) $2ta{n}^2{45}^{\circ }+co{s}^2{30}^{\circ }-si{n}^2{60}^{\circ }$
$=2\times (1{)}^2+(\frac{\sqrt{3}}{2}{)}^2-(\frac{\sqrt{3}}{2}{)}^2=2$