Trigonometry C2 Exam Solutions
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How to solve trigonometric equations?
A-level Maths Edexcel C2 June 2008 Q9a
Solving a trig equation in a given range
Solve, for 0 ≤ x < 360°,
(a) sin(x - 20°) = 1/√2
Solving a trig equation in a given range
Solve, for 0 ≤ x < 360°,
(b) cos 3x = - 1/2
(a) Show that the equation
4 sin2 x + 9 cos x – 6 = 0
can be written as
4 cos2 x – 9 cos x + 2 = 0.
Worked solution to this question on trigonometry.
(b) Hence solve, for 0 ≤ x < 720°,
4 sin2 x + 9 cos x – 6 = 0,
giving your answers to 1 decimal place
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