please help patryk: 2. Consider the equation 3 cos 2x + sin x = 1 (a) Write this equation in the form f (x) = 0 , where f (x) = p sin2 x + q sin x + r , and p , q , r ∈ . (b) Factorize f (x). (c) Write down the number of solutions of f (x) = 0, for 0 ≤ x ≤ 2π. Answers: Working: (a) ..................................................... (b) ..................................................... (c) ..................................................... 3. (a) Write the expression 3 sin2 x + 4 cos x in the form a cos 2 x + b cos x + c. (b) Hence or otherwise, solve the equation 3 sin2 x + 4 cos x – 4 = 0, 0° ≤ x ≤ 90°. Working: Answers: (a) .................................................................. (b) ..................................................................

bezendu: Describe your calculations.

PW : Sorry, English version in prepare..