exam
Maths Puzzle
Numerical Ability
Find the center and the radius of the circle whose equation is given: x^2+y^2+6x+8=0
Center = (_,_) Radius = _
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exam Other Question
4. The line
y=0.15x+0.79
represents an estimate of the average cost of gasoline for each year. The line
0.11x-y=-0.85
estimates the price
a.(1-tan^2u)/(1+tan^2u)=cos(2u)
I think this is a half angle identity?verify the identity.
b. compare the graphs of y1=(1-tan^2u)/(1+tan^2u) and y2=cos(2u)