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
Mathematics
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}
Mathematics
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
Mathematics
Use the quadratic formula to solve the equation. Simplify any radicals.2m2 + 6m + 2 = 0
A. 
B. 
C. 
D. 
Mathematics