Use the formula
0.6228
Mathematics
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Evaluate the integral.Use the formula
to evaluate the integral. 
A. x cot-1 x + ln sin(cot-1 x) + C B. x cot-1 x - x + C C. x cot-1 x - ln sin(cot-1 x) + C D. x cot-1 x - ln sin x + C
Mathematics
Find the indicated trig function of ?, if ? is an angle in standard position with the terminal side defined by the given point.(21, 28); Find cos ?.
A. 
B. 
C. 
D. 
Mathematics
Solve by completing the square. Give exact solutions. Simplify radicals and reduce.x2 + 3x - 9 = 0
A. 
B. 
C. -3 ± 3
D. 
Mathematics
Express in terms of i.
A. 2i
B. -2i
C. -2
D. 2
Mathematics