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n14r96

  • one year ago

Write the expression as either the sine, cosine, or tangent of a single angle. cos pi/3 cos pi/5 + sin pi/3 sin pi/5

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  1. stgreen
    • one year ago
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    use the identity: cos (a-b)=cos a cos b +sin a sin b

  2. n14r96
    • one year ago
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    but how do u use that to solve it

  3. stgreen
    • one year ago
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    in this case you have a=pi/3 and b=pi/5 lets say then cos pi/3 cos pi/5 + sin pi/3 sin pi/5=cos (pi/3 - pi/5)=cos (-2pi/15)=cos(2pi/15) you could've different answers due to periodicity..but all are same in numeric value

  4. n14r96
    • one year ago
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    thank you

  5. stgreen
    • one year ago
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    my pleasure

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