a) Given that 2 sin cos = 1, show that 2 cos +
Question:
a) Given that 2 sin² θ − cos θ = 1, show that 2 cos² θ + cosθ − 1 = 0.
b) Hence solve the equation 2 sin²(θ − 20°) − cos (θ − 20°) − 1 = 0
for 0° ≤ θ ≤ 180°.
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ANSWER a Starting with 2 sin cos 1 we can rearrange it to solve for cos 2 sin cos 1 2 1 c...View the full answer
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Related Book For
Complete Pure Mathematics 1 For Cambridge International AS & A Level
ISBN: 9780198427438
2nd Edition
Authors: Jean Linsky, Brian Western, James Nicholson
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