Solve over the interval [0, 2?).f(x) = cos2 x - sin2 x - 1, f(x) > 0

A.  ?  ? 
B. [0, 2?)
C. ?
D. (0, ?) ? (?, 2?)


Answer: C

Mathematics

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A. 50 B. 475 C. 100 D. 75

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Write  and  in trigonometric form and find their product.

?
 
?

A. ?
B.
C. ?
D. ?
E. ?

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A. (r - 2 + s)(r + 2 + s) B. (r - 4 + s)(r + 4 - s) C. (r - 2 + s)(r - 2 - s) D. (r + 2 + s)(r + 2 - s)

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