Complete the identity. = ?

A. cos ? + sin ?
B. cos ? - sin ?
C. cot ? - 1
D. cot ? + tan ?


Answer: D

Mathematics

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Find the gradient ?f.f(x, y) = cos4(x6y6)

A. -24x5y6 cos3(x6y6) sin(-24x5y6)i - 24x6y5 cos3(x6y6) sin(x6y6)j B. -24x5y6 cos3(x6y6) sin(x6y6)i - 24x6y5 cos3(x6y6) sin(x6y6)j C. -24x5y6 cos3(x6y6) sin(x6y6)i - 24x6y5 cos3(x6y6) sin(x5y5)j D. -24x5y6 cos3(x6y6) sin(x6y6)i - 24x6y5 cos3(x6y6) sin(-24x6y5)j

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Compare the decimal numbers, and insert <, >, or = to form a true statement.0.0788  788,000

A. = B. > C. <

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Express the graph shown using interval notation. Also express it as an inequality involving x.

A. [-4, 2] -4 ? x ? 2 B. [-4, 2) -4 ? x < 2 C. (-4, 2] -4 < x ? 2 D. (-4, 2) -4 < x < 2

Mathematics

Solve the system of equations by the elimination method. Check your solutions. For any dependent equations, write your answer in ordered pair form.

A. {(3, 9)} B. {(4, 9)} C. ? D. {(4, 8)}

Mathematics