Show that the equation is an identity.cos(2 cos-1 x) = 2x2 - 1
What will be an ideal response?
cos 2? = 2 cos2? - 1 is the Double-Angle Identity
Let ? = cos-1 x. Then cos(2 cos-1 x) = 2 cos2(cos-1 x) - 1 = 2x2 - 1
Mathematics
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Graph the linear inequality.2x + 3y ? 6
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Identify the curve as simple, closed, both, or neither.
A. Simple B. Neither C. Closed D. Both
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A point on the terminal side of an angle ? is given. Find the exact value of the indicated trigonometric function of ?.(4, -5)Find cot ?.
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D. - 
Mathematics
Multiply or divide.
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D. 
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