AP Calculus things to rmb

Limits and few deriv`atives for rn(will be updated)

lim [sin(x)/x] =

1

lim [(cos(x)-1)/x] =

1

lim [sin(ax)/x] =

a

lim [sin(ax)/sin(bx)] =

a/b

d/dx[sin(x) ] =

cos(x)

d/dx[cosx] =

-sin(x)

d/dx[tanx] =

sec²x

d/dx[lnx] =

1/x

d/dx[e^x]

e^x