Verify that each equation is an identity.cos(4?) = cos4 ? - 6 sin2 ? cos2 ? + sin4 ?
What will be an ideal response?
cos(4?) = cos[2(2?)] = cos2(2?) - sin2(2?) = 
= cos4 ? - 6 sin2 ? cos2 ? + sin4 ?
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Measurements are made at two different times. Find the absolute change and then find the percentage change. Round answers to the nearest tenth if necessary.At a certain college, the percentage of male students decreased from 
in 1970 to 
this year.
A. Absolute change: -23.7 percentage points Percentage change: -14% B. Absolute change: -14 percentage points Percentage change: -31.1% C. Absolute change: -14 percentage points Percentage change: -23.7% D. Absolute change: 14 percentage points Percentage change: 31.1%
Write an equation in slope-intercept form of a line satisfying the set of conditions.Through (-2, -17), parallel to 4x + 5y = -48
A. y = - 
x - 
B. y = - 
x - 
C. y = - 
x - 
D. y = 
x + 
Find the value of the indicated variable for the values given.C = 2?r; determine r when C = 37.68 and ? = 3.14
A. 236.63 B. 6 C. 12 D. 40.82
Solve the equation for y.6x + 9y = 17
A. y = 
x + 
B. y = - 
x + 
C. y = 6x - 17
D. y = 
x - 