Question
Asked Nov 21, 2019
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Use an Addition or Subtraction Formula to write the expression as a trigonometric function of one number.
cos(5°) cos(85°) - sin(5°) sin(85°)
Find its exact value.
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Use an Addition or Subtraction Formula to write the expression as a trigonometric function of one number. cos(5°) cos(85°) - sin(5°) sin(85°) Find its exact value.

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Expert Answer

Step 1

cosA*cosB-sinA*sinB= cos(A+B)

Here A=5 and...

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cos(5) cos(85)-sin(5)sin( 85) =cos(5+85) =cos(90)

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