Solve the equation (x in radians and ? in degrees) for all exact solutions where appropriate. Round approximate answers in radians to four decimal places and approximate answers in degrees to the nearest tenth.cos2 x + 2 cos x = -1
A. {? + 2n?}
B. {2n?}
C. {n?}
D. 
Answer: A
Mathematics
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Find the value of the expression.(-19 - 15)(-10 - 21)
A. -44 B. 1054 C. -1054 D. 44
Mathematics
Provide an appropriate response.Find any local extrema (maxima, minima, or saddle points) of 
given that 
and 
A. Saddle point at 
B. Local minimum at 
C. Saddle point at 
D. Local maximum at 
Mathematics
Solve the equation.
+ 
= 
A. 6, 4 B. -5, -5 C. 5, 5 D. 4, 6
Mathematics
Divide.
A. 
B. 36
C. 7
D. 3.6
Mathematics