Use the Half-angle Formulas to find the exact value of the trigonometric function. sin 165°
A. 
B. 
C. - 
D. - 
Answer: A
Mathematics
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Use this diagram of a regular pentagon to explain how to determine the formula for finding the vertex angle in a regular polygon.
Mathematics
Solve the following system by any appropriate method. If there is no real number solution, so state.y - 6x = 06x2 + y2 = 42
A. (-1, -6) B. (-1, -6), (1, 6) C. (-1, -6), (1, 6), (-1, 6), (1, -6) D. (1, 6)
Mathematics
Multiply and simplify.
? 
A. - 
B. 
C. 
D. -12
Mathematics
Which of the following steps should be applied to solve the equation for x? x/4.2 = -1.36
A) multiply both sides of the equation by –1.36 B) multiply both sides of the equation by 4.2 C) divide both sides of the equation by –1.36 D) divide both sides of the equation by 4.2 E) add 4.2 to both sides of the equation
Mathematics