Multiply.
? 
A. 
B. 
C. 
D. 
Answer: D
Mathematics
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Differentiate the function.r(t) = (cot t)i + (csc t)j
A. r'(t) = (-sec2 t)i - (tan t sec t)j B. r'(t) = (-csc2 t)i - (cot t csc t)j C. r'(t) = (sec2 t)i + (tan t sec t)j D. r'(t) = (csc2 t)i + (cot t csc t)j
Mathematics
Solve the system using matrices. 6x - y + 9z = 219x + 7z = 342y+ z = 13
A. No solution B. (-3, 6, 6) C. (3, 1, 6) D. (3, 6, 1)
Mathematics
Factor.7x2y2 - 17xy - 12
A. (7xy + 4)(xy - 3) B. (7x + 4y)(x - 3y) C. (7xy + 3)(xy - 4) D. (7xy - 3)(xy + 4)
Mathematics
Find the exact value under the given conditions.cos ? = 
, 0 < ? < 
; sin ? = - 
, - 
< ? < 0Find tan(? + ?).
A. 
B. 
C. 
D. 
Mathematics