Write the complex number in trigonometric form r(cos ? + i sin ?), with ? in the interval [0°, 360°).7
+ 7i
A. 14( cos 300° + i sin 300°)
B. 14( cos 60° + i sin 60°)
C. 14( cos 330° + i sin 330°)
D. 14( cos 30° + i sin 30°)
Answer: D
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Write the expression below in terms of natural logarithms, and then give a calculator approximation (correct to four decimal places).
?
?
A. 
B. 
C. 
D. 
E. 
Find an equivalent equation in rectangular coordinates.r = 2(sin ? - cos ?)
A. 2x2 + 2y2 = y - x B. 2x2 + 2y2 = x - y C. x2 + y2 = 2x - 2y D. x2 + y2 = 2y - 2x
Two sides of a right triangle ABC (C is the right angle) are given. Find the indicated trigonometric function of the given angle. Give exact answers with rational denominators.Find cos A when a = 
and c = 11.
A. 
B. 
C. 
D. 
Solve the equation. Express irrational solutions in exact form and as a decimal rounded to three places.log2(x2 - 16) = 7
A. {-
, 
} ? {-8.062, 8.062}
B. {-4
, 4
} ? {-10.583, 10.583}
C. {-12, 12}
D. {12}