Subtraction Formula for Cosine: Addition Formula for Cosine: Addition a Formula for Sine: Subtraction Formula for Sine:
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NATIONAL SENIOR CERTIFICATE GRADE 11 · 2 x x x (6) 5. 3 5.3 .1 Prove the identity : x x x x x cos 2 cos 1 sin 1 sin cos (5) 5.3.2 For which values of x in the interval 0° ≤ x
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