Google has a function in its search box are little known yet very useful. It gives me like one of the best ideas he had, after GMail.
Google What is Calc?
is Google's online calculator lets you perform mathematical operations of all kinds, such as addition, multiplication, data conversion (inches to feet, dollars to euros), and many more things!
And how should I do?
You just need to write what you want to calculate the google search box: 
For example, try typing 1 + 1 and looking, you'll see the result immediately:
What I can do?
Lots of things! we'll see the most common.
common arithmetic operators: +, -, /, *
Examples: 1 +1, 1-1, 10 / 2, 2 * 2
Percentages: % of, Percent of
Example: 15% of 100, 15 Percent of 100
Rest of division: mod,%
Example: 10 mod 2, 10% 2
Raise to a power: ^ **
Example: 2 ^ 2, 2 ** 2
Square root: th root of, of square root, cube Rooth of
Example: 2th root of 100, square root of 4, cube root of 81
Reciprocal : Reciprocal of
Example: Reciprocal of 7. (Returns the value of 1 / 7)
Trigonometric and inverse trigonometric functions:
without : Breast
cos: cosine
as : tangent
sec: secant
csc: cosecant
cot: cotangent
arcsin, arccos
arcsine : cosine
arctan: atan
arcsec : inverse secant
arccsc : inverse cosecant
arcctn : artocotantgente
Example: sin (pi) returns 0
Hyperbolic Functions:
sinh, cosh, tanh, csch , arsinh, arccsch
logarithms: ln
: logarithm base 10 log
: lg
log: logarithm base 2
exp: exponential
!: factorial
I encourage you to test the true power of the calculator, the next installment we are going to see something very interesting (but very much eh!).
