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More Trigonometric Identities

Problems

Products of Functions

Sums and Differences of Functions

Problem : Express the following as a product: sin(100) - sin(60) .

sin(100) - sin(60) = 2 cos((100 + 60))sin((100 - 60)) = 2 cos(80)sin(20) .

Problem : Express the following as a product: cos(35) + cos(10) .

cos(35) + cos(10) = 2 cos((35 + 10))cos((35 - 10)) = 2 cos(22.5)cos(12.5) .

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