Find the exact value of the sum.cos 105° - cos 15°

A. -
B.
C.
D. -

Answer: D

Mathematics

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A. +  +  + 10x + 5x³ + x⁵
B. +  +  + 10x^1/2 + 5x^3/2 + x^5/2
C. -  +  - 10x^1/2 + 5x^3/2 - x^5/2
D. +  +  + 10x^3/2 + 5x^5/2 + x^7/2

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Mathematics

Alex, Beverly, and Cal live on the same straight road. Alex lives 9 miles from Beverly and Cal lives 4 miles from Beverly. How far does Alex live from Cal? ? If there is more than one answer, separate them with commas. ?

What will be an ideal response?

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Mathematics

Find the exact value of the logarithmic expression.log7

A. -2 B. 7 C. 2 D. -7

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Mathematics

Find the exact value of y, or state that y is undefined.y = sec-1 (1)

A. ?
B. 0
C.
D. -?

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Mathematics