Show that, for small values of \(\theta\) measured in radians
$$\cos 4 \theta + 2 \sin 3 \theta - \tan 2 \theta \approx A + B \theta + C \theta ^ { 2 }$$
where \(A , B\) and \(C\) are constants to be found. [0pt]
[3 marks]
9
Use your answer to part (a) to find an approximation for
$$\cos 0.28 + 2 \sin 0.21 - \tan 0.14$$
Give your answer to three decimal places. [0pt]
[2 marks]