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teachoo.com
Ex 3.3, 11 - Prove that cos (3pi/4 + x) - cos (3pi/4 - x)
Ex 3.3, 11Prove that cos (3π/4 x) – cos (3π/4−x) = –√2 sin x Solving L.H.S. cos (3π/4 x) – cos (3π/4−x) = –2 sin (((𝟑𝛑/𝟒 𝐱) (𝟑𝛑/𝟒 − 𝐱))/𝟐) sin (((𝟑𝛑/𝟒 𝐱) − (𝟑𝛑/𝟒 − 𝐱))/𝟐) = –2 sin (((3π/4 3π/4) (𝑥 − 𝑥))/2) sin ((3π/4 x − 3π/4 x)/2) = –2 sin (((3π
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