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Lesson#5 [ Question No. 4 ]
5 Views • Oct 01, 2015
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Question No. 4
Q4: Prove that:
(i) cos 20°+cos100°+cos140°=0
(ii): sin(π/4−θ) sin(π/4+θ)=1/2 cos2θ
Math.Ex.10.4, Part05-10.4
(iii): (sinθ+sin3θ+sin5θ+sin7θ)/(cosθ+cos3θ+cos5θ+cos7θ)=0
Trigonometric Identities
Chapter No 10
Exercise No 10.4
Mathematics
part 1
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