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Jasamara2010 Jasamara2010
  • 24-01-2017
  • Mathematics
Answered

Write the expression as either the sine, cosine, or tangent of a single angle.

cos(π/3)cos(π/5) + sin(π/3)sin(π/5)

Verified Answer :

LammettHash
LammettHash LammettHash
  • 24-01-2017

\(\cos\dfrac\pi3\cos\dfrac\pi5+\sin\dfrac\pi3\sin\dfrac\pi5=\cos\left(\dfrac\pi3-\dfrac\pi5\right)=\cos\dfrac{2\pi}{15}\)

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