Use the properties of the trigonometric functions to find the exact value of the expression. Do not use a calculator.sin2 80° + cos2 80°
A. -1
B. 0
C. 1
D. 2
Answer: C
Mathematics
You might also like to view...
Find the cross product and determine whether the proportion is true or false.
= 
A. 60 = 60; true B. 120 = 120; true C. 30 ? 120; false D. 18 ? 200; false
Mathematics
Use the given information to find the exact value of the trigonometric expression.sin ? = - 
; 
< ? < 2?
Find tan(2?).
A. 
B. - 
C. 
D. - 
Mathematics
Use Gaussian elimination to find the complete solution to the system of equations, or state that none exists.x + 3y + 2z=114y + 9z=-12x + 7y + 11z=- 1
A. {(
+ 20, 
+ 3, z)}
B. {(
+ 20, - 
- 3, z)}
C. {(- 
+ 20, - 
+ 3, z)}
D. {(
+ 20, - 
+ 3, z)}
Mathematics
Tell where the function is decreasing.
?
?
A. 
B. 
C. always increasing
D. always constant
E. always decreasing
Mathematics