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