MaxWong

Pie is a round food.

or you mean pi?

You cannot calculate pi because it have infinite digits.

I will give you a few digits of pi: 3.1415926535897932384626433

Using the 1st identity......

$sin(50x-1) = (sin50x)(cos1)-(cos50x)(sin1)$

4+7..... obviously = 11?

Why?

You cannot evaluate infinity, on any calculators.

$f(x)=\frac{ln^2x}{2}=\frac{{(ln(x))}^2}{2}=\frac{2lnx}{2}=ln x$

$f(e) = ln (e) = 1$

9 7/10 = 9.7

9.7 is nearer to 9.5 than 10.0

therefore 9 7/10 rounded to the nearest half is 9.5

Thx 

Let $\alpha$ and $\beta$ be the 2 roots of the equation ax²+bx+c

$\alpha + \beta = -\frac{b}{a}$

$\alpha \beta = \frac{c}{a}$

$\frac{1}{2\alpha}+\frac{1}{2\beta}$

=$\frac{\alpha+\beta}{2\alpha\beta}$

=$\frac{-\frac{-8}{2}}{2(\frac{7}{2})}$

=$\frac{4}{7}$

infinity is divisible by 360 (I hope because infinity over anything = infinity), tan(360) = 0, therefore tan(infinity) = 0