Question 8 Find the exact value of cos165° using the fact that 165° 135° + 30° . (Note: The answer has been factored and has no radicals in the denominator). cos165° -V2 ( [ Select ] [ Select ]

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A: Given that: cos(67.5°)

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A: According to the expression, we have

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A: cos10°cos50°cos70°=√3/8Explanation:Step 1: Step 2: Step 3: Step 4:

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A: 2 ( cos 115 degrees + i sin 115 degrees) x 8 ( cos 59 degrees + i sin 59 degrees).

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A: Given:

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Q: - Find the three roots of 12Z30°

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Q: Find the exact value of cos 195°.

A: we know  cos(π+x)=-cosxcos(a-b)=cos(a)cos(b)+sin(a)sin(b)

Q: Factor the trigonometric expression completely. 3 csc2 Y + 7 csc Y+2

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