Complete the identity.sin(4?) sin(6?) cos(4?) cos(6?) = ?

A. cos2(48?)
B.
C.
D.

Answer: C

Mathematics

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Find the value of d2y/dx2 at the point defined by the given value of t.x = tan t, y = 7 sec t, t = 

A. - 
B. 7
C.
D. - 

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Solve the equation.|x2 + 3x| = 0

A. no solution B. {0, -3} C. {3, 0, -3} D. {3, 0}

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Write the whole number in standard form.Seventy-nine thousand, nine hundred three

A. 79,930 B. 79,903 C. 7993 D. 790,903

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Find the inverse of the one-to-one function.f(x) = 

A. f-1(x) = x - 4
B. f-1(x) = x3 - 4
C. f-1(x) = 
D. f-1(x) = x3 + 16

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Mathematics