Use a sum-to-product identity to rewrite the expression.sin 20° - sin 40°
A. 2(cos (-10.0°) cos (30.0°))
B. 2(cos (-10.0°) sin (30.0°))
C. 2(sin (-10.0°) cos (30.0°))
D. 2(sin (-10.0°) sin (30.0°))
Answer: C
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Find fx, fy, and fz.f(x ,y, z) = sin (xy) cos (yz2)
A. fx = y cos (xy) cos (yz2); fy = z2 sin (xy) sin (yz2)- x cos (xy) cos (yz2); fz = 2yz sin (xy) sin (yz2) B. fx = y cos (xy) cos (yz2); fy = x cos (xy) cos (yz2) - z2 sin (xy) sin (yz2); fz = -2yz sin (xy) sin (yz2) C. fx = y cos (xy) cos (yz2); fy = x cos (xy) cos (yz2); fz = -2yz sin (xy) sin (yz2) D. fx = y cos (xy) cos (yz2); fy = x cos (xy) cos (yz2) - z2 sin (xy) sin (yz2); fz = 2yz sin (xy) sin (yz2)
Simplify by combining like terms.5x + 4y + 2x + 8y
A. 12x + 7y B. 7x + 12y C. 7x - 12y D. 19xy
Use the distributive property to write the sum as a product.15 ? z + 15 ? 2
A. 15(z + 2) B. (17z) C. (30z) D. (15z + 30)
Rotate the axes so that the new equation contains no xy-term. Graph the new equation.x2 + xy + y2 - 3y - 6 = 0
A. 
B. 