exam
Maths Puzzle
Numerical Ability
Simplify the expression.
Cos(2arctan(x))
arctan is just the inverse of tan Example tan^-1
i keep getting (1-x^2)/(1+x) althoutgh it keeps saying that its wrong
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exam Other Question
If the sides of a square are lengthened by 7 cm, the area becomes 144cm^2. Find the length of a side of the original square.
The length of a side of the original square is _____ cm.
Find polynomials f(x), g(x), and h(x), if they exist, such that for all x,
/f(x)/-/g(x)/+h(x)={-1 if x<-1
{3x+2 if -1<or=x<or=0
{-2x+2i