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.  +  +  + 10x1/2 + 5x3/2 + x5/2
C.  -  +  - 10x1/2 + 5x3/2 - x5/2
D.  +  +  + 10x3/2 + 5x5/2 + x7/2

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?

Mathematics

Find the exact value of the logarithmic expression.log7 

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

Mathematics

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

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

Mathematics