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Find the exact value of the following expression without using a calculator. Check your answer with a calculator.cos (315°) cos (60°)- sin (315) sin (60°cos (315) cos (60°)- sin (315) sin (60)(Simplify your answer, including any radicals Use integers or fractions for any numbers in the expression.)C

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Can you explain how to answer this question? HOW do I arrive at an answer without using a calculator?

Find the exact value of the following expression without using a calculator. Check your answer with a calculator.
cos (315°) cos (60°)- sin (315) sin (60°
cos (315) cos (60°)- sin (315) sin (60)
(Simplify your answer, including any radicals Use integers or fractions for any numbers in the expression.)
C
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Find the exact value of the following expression without using a calculator. Check your answer with a calculator. cos (315°) cos (60°)- sin (315) sin (60° cos (315) cos (60°)- sin (315) sin (60) (Simplify your answer, including any radicals Use integers or fractions for any numbers in the expression.) C

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Step 1

Obtain the exact values of the given expression as follows. Recall the given facts.

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Step 2

Obtain the exact valu...

cos (315) cos (60)-sin (315)sin (60)
cos (315 60)
=cos (375)
= cos (360 15)
cos15
30
= cOs
2
1+cos30
2
2
2
2+ 3
2
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cos (315) cos (60)-sin (315)sin (60) cos (315 60) =cos (375) = cos (360 15) cos15 30 = cOs 2 1+cos30 2 2 2 2+ 3 2

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