SOLUTION: write the expression as sine, cosine or tangent of a single angle.
cos(pi )/(6)cos(pi )/(7)-sin(pi )/(6)sin(pi )/(7)
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-> SOLUTION: write the expression as sine, cosine or tangent of a single angle.
cos(pi )/(6)cos(pi )/(7)-sin(pi )/(6)sin(pi )/(7)
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Question 1071448: write the expression as sine, cosine or tangent of a single angle.
cos(pi )/(6)cos(pi )/(7)-sin(pi )/(6)sin(pi )/(7) Answer by ikleyn(52803) (Show Source):
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write the expression as sine, cosine or tangent of a single angle.
cos(pi )/(6)cos(pi )/(7)-sin(pi )/(6)sin(pi )/(7)
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Apply the formula of sum for cosine:
cos(a)*cos(b) - sin(a)*sin(b) = cos(a+b).
See the lesson Addition and subtraction formulas in this site.
You will get
= = = .
