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Mathematical Methods for Physics and Engineering - Matematica.NET

Mathematical Methods for Physics and Engineering - Matematica.NET

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1.8 EXERCISES(a) the sum of the sines of π/3 <strong>and</strong>π/6,(b) the sine of the sum of π/3 <strong>and</strong>π/4.1.8 The following exercises are based on the half-angle <strong>for</strong>mulae.(a) Use the fact that sin(π/6) = 1/2 to prove that tan(π/12) = 2 − √ 3.(b) Use the result of (a) to show further that tan(π/24) = q(2 − q) whereq 2 =2+ √ 3.1.9 Find the real solutions of(a) 3 sin θ − 4cosθ =2,(b) 4 sin θ +3cosθ =6,(c) 12 sin θ − 5cosθ = −6.1.10 If s = sin(π/8), prove that8s 4 − 8s 2 +1=0,<strong>and</strong> hence show that s =[(2− √ 2)/4] 1/2 .1.11 Find all the solutions ofsin θ +sin4θ =sin2θ +sin3θthat lie in the range −π

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