Show that the equation is not an identity by finding a value of x for which both sides are defined but not equal.cos x - cos x sinx = cos3 x
A. 
B. ?
C. 0
D. 
Answer: A
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Evaluate or simplify the given expression.cos-1 
A. ?
B. 
C. 
D. 0
The concentration C, in milligrams per deciliter, of a certain drug in the bloodstream t hours after injection is given in the following table. t0123 C36.0030.2425.4021.34? A: Make a table of successive ratios to show that the concentration of the drug can be modeled by an exponential function. Round your answer to two decimal places.B: Find an exponential model for the data. Round your answer to two decimal places.C: Plot the graph of the data points along with the exponential model. Include up to 10 hours.D: According to the model, how long will it take for the drug concentration to decay to 14.00% of the initial amount? Round your answer to two decimal places.
What will be an ideal response?
Use a calculator to find the approximate value of the composition. Round your answer to four decimal places. The expression may be undefined.cos 
A. -0.3827 B. 0.8819 C. 0.3827 D. -0.8819
Graph the ellipse.
+ 
= 1
A. 
B. 
C. 
D. 