Subtraction Formula for Cosine - Noorduyn's Math …...Compound Angles cos(x+ y) = cos x cos y...

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Subtraction Formula for Cosine: Addition Formula for Cosine: Addition a Formula for Sine: Subtraction Formula for Sine:

Ex 1: Find the exact value of sin50°cos20° - cos50°sin20° Ex 2: Calculate sin exactly Ex 3: If the cosa= 2/3, and cos

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