Use trigonometric identities to find the exact value.sin 260° cos 20° - cos 260° sin 20°
A. - 
B. - 
C. 
D. - 
Answer: A
Mathematics
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Find the torsion of the space curve.r(t) = (6t sin t + 6 cos t)i + (6t cos t) - 6 sin t)j - 5k
A. ? = -1 B. ? = 1 C. Undefined D. ? = 0
Mathematics
Use the quadratic formula to solve the equation. (All solutions are real numbers.)x2 = 7 - 8x
A. {-1 + 
, -1 - 
}
B. {4 + 
}
C. {-4 + 
, -4 - 
}
D. {-4 + 2
, -4 - 2
}
Mathematics
Find the domain of f and write it in interval notation.f(x) = ln(7 - x)
A. (-?, -7) B. (-?, 7) C. (7, ?) D. (-7, ?)
Mathematics
Solve the problem.If f(x) = 
and f(-3) = 9, what is the value of A?
A. A = -15 B. A = 43 C. A = -43 D. A = 15
Mathematics