Verify the identity.cos(? - ?) - cos(? + ?) = 2 sin ? sin ?
What will be an ideal response?
cos (? - ?) - cos (? + ?) = cos ? cos ? + sin ? sin ? - ( cos ? cos ? - sin ? sin ?) = 2 sin ? sin ?.
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Find the absolute value of the complex number. Round your answer to two decimal places, if necessary.3
A. 3 B. 9 C. 1.5 D. 1.73
Solve the problem.The length and width of a rectangle have a sum of 80. What dimensions give the maximum area?
A. Length 39 and width 41 B. Length 30 and width 50 C. Length 31 and width 49 D. Length 40 and width 40
Use the graph to determine the equation of the parabola.
A. x = (y - 2)2 - 3 B. y = (x + 2)2 + 3 C. y = (x - 2)2 - 3 D. x = (y + 2)2 - 3
Find the numbers at which f is continuous. At which numbers is f discontinuous?f(x) = 3 cos x
A. continuous for all real numbers except x = 1 B. continuous for all real numbers C. continuous for all real numbers except x = 0 D. continuous for all real numbers except x = 3