# More Trigonometric Identities

### Problems

Problem : Use α = 30 o and β = 45 o to find the sine, cosine, and tangent of 75 o .

Problem : Use α = 135 o and β = 30 o to find the sine, cosine, and tangent of 105 o .

Problem : Express the following as a function of a single angle: sin(20 o )sin(30 o ) + cos(20 o )cos(30 o ) .

Problem : Express the following as a function of a single angle: .

Problem : Express the following as a function of a single angle: sin(340 o )cos(120 o ) + cos(340 o )sin(120 o ) .

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