Use the product-to-sum identities to rewrite the expression as the sum or difference of two functions.sin 4? cos 5?

A.  sin 9? -  sin ?
B. sin (cos 20?2)
C.  cos 9? -  cos ?
D.  cos 9? +  sin ?


Answer: A

Mathematics

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Determine the quadrant in which the terminal side of angle ? lies.sec ? < 0 and tan ? < 0

A. Quadrant I B. Quadrant III C. Quadrant IV D. Quadrant II

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Solve the equation by making an appropriate substitution.x2/3 - 3x1/3 + 2 = 0

A. {1, 2} B. {-2, -1} C. {1, 8} D. {-8, -1}

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Add or subtract as indicated and write the result in standard form.(-4 - 5i) + (3 - 3i) + (-2 - 3i)

A. -1 - 8i B. 1 - 5i C. -3 - 11i D. -9 - 5i

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Use the quadratic formula to solve the equation. Simplify any radicals.2m2 + 6m + 2 = 0

A.
B.
C.
D.

Mathematics