Use the appropriate sum or difference identity to write the given expression as a function of x alone.cos (270° - x)
A. - sin x
B. cos x
C. sin x
D. - cos x
Answer: A
Mathematics
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Solve. Round to the nearest hundredth.
A) 14.67
B) 1.09
C) 44.00
D) 0.11
E) 12.00
Mathematics
Use the fact that the trigonometric functions are periodic to find the exact value of the expression. Do not use a calculator.tan 720°
A. 
B. -1
C. 0
D. undefined
Mathematics
Write the first six terms of the arithmetic sequence with the given properties. ? a = -7, d = -1 ? Please enter your answer as six numbers in order, separated by commas.
What will be an ideal response?
Mathematics
Evaluate.-30 - (- 150)
A. 120 B. 180 C. -120 D. -180
Mathematics