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Sin^2(X) + Cos^2(X) - elwiittle
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Example 15 - Prove cos (pi/4 + x) + cos (pi/4 - x) = root 2 cos x
SINC + SIND = 2 SIN (C+D)/2 COS (C-D)/2 | COSC + COSD = 2 COS (C+D)/2
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Example 26 - Prove cos 2x cos x/2 - cos 3x cos 9x/2 = sin 5x
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Question 7 - Solve 2 cos^2 x + 3 sin x = 0 - General Solution -Teachoo