Verify the identity.cos 
= -sin x
What will be an ideal response?
cos 
= cos x cos 
- sin x sin 
= (cos x)(0) - (sin x)(1) = -sin x.
Mathematics
You might also like to view...
Find the slope of the line going through the given pair of points.(-5, 0) and (0, 2)
A. 
B. - 
C. 
D. - 
Mathematics
Use the formula for the sum of the first n terms of a geometric sequence.Find the sum of the first 13 terms of the geometric sequence: -4, -12, -36, -108, -324, . . .
A. -3,188,644 B. -3,188,607 C. -3,188,664 D. -3,188,642
Mathematics
Use Heron's formula to solve the problem.An architect has measured the length of the sides of a triangular yard as 270 ft, 300 ft, and 
Find the area of the yard. Round to the nearest whole number. 
A. 1838 ft2 B. 3184 ft2 C. 39,635 ft2 D. 22,883 ft2
Mathematics
Add. 6,886+ 442
A. 7,328 B. 7,338 C. 6,328 D. 7,228
Mathematics