Find the exact value by using a sum or difference identity.cos 285°
A. - 
(
+ 1)
B. - 
(
- 1)
C. - 
D. 
Answer: D
Mathematics
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Approximate the square root. Round to the nearest tenth, if needed.
A. 4.6 B. 3.6 C. 3.5 D. 3.7
Mathematics
Simplify.23 - [8 + (8 - 3)] - (5 - 3)3
A. 18 B. 10 C. 2 D. 28
Mathematics
Let s be a real number corresponding to the point (a, b) on the unit circle. Use this information to determine the sine and cosine of the real number.s + 
A. sin 
= -a, cos 
= b
B. sin 
= b, cos 
= -a
C. sin 
= a, cos 
= -b
D. sin 
= a, cos 
= b
Mathematics
Determine the integral by making an appropriate substitution.
A. 
+ C
B. 
x4(x4 + 7)3/2 + C
C. 
(x4 + 7)3/2 + C
D. 
(x4 + 7)3/2 + C
Mathematics