Use the information given about the angle ?, 0 ? ? ? 2?, to find the exact value of the indicated trigonometric function.cos(2?) = , 0 < ? < Find cos ?.

A.
B.
C.
D.

Answer: C

Mathematics

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Find the indicated value.Find n if log n = 19, where n is the number of sodium ions in a typical mammalian muscle cell.

A. n = e19 B. n = 190 C. n = 1019 D. n = 10-19

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Decide whether the equation is or is not an identity.tan (? + ?) = tan ?

A. Not an identity B. Identity

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Write the rational expression in lowest terms.

A.
B.
C.
D. - 

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Find the least common multiple.x2 + 3x, x2 + 4x + 3

A. (x + 2)2 B. x(x + 3)(x + 1) C. x(x + 2)2 D. x(x + 2)(x + 1)

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