 # Trigonometry C3 Examination Questions

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A-Level Maths Edexcel C3 June 2008 Q5a
This question is on proving a trigonometric identity
(a) Given that sin2 θ + cos2 θ ≡ 1, show that 1 + cot2 θ ≡ cosec2 θ
A-Level Maths Edexcel C3 June 2008 Q5b
This question is on solving a trigonometric equation.
(b) Solve, for 0 ≤ θ < 180°, the equation
2 cot2 θ – 9 cosecθ = 3,

A-Level Edexcel C3 January 2010 Q3(a)
Worked solution to this question on trigonometry
(a) Express 5 cos x – 3 sin x in the form R cos (x + α), where R > 0 and 0 < α < π/2.
A-Level Edexcel C3 January 2010 Q3(b)
(b) Hence, or otherwise, solve the equation
5 cos x – 3 sin x = 4
for 0 ≤ x < 2π, giving your answers to 2 decimal places.

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