There is no reason to learn math mentally. Calculators were made for a reason. amirite?

Fine, then what quadrant does x lie in? tan(x)=3/4 cos(x)=-4/5

by Anonymous 12 years ago

(Your+name+(optional)): they said doing it mentally was useles....

by Anonymous 12 years ago

Yeah but I'm guessing that Your+name+(optional) is proving there is some Math which has to be done on paper and you can't do that on a caclulator..? I'm not too sure though!

by Anonymous 12 years ago

(ButI'mNoMathWhizz): Ya there's no way you could do that on a calculator.

by Anonymous 12 years ago

(Your+name+(optional)): We spent 2-3 months on trig. Our teacher didn't tell us a way to find out what quadrant something lies in using a calculator, probably because it'd be more effort than doing it mentally. Anyway, I have yet to find a way to graph a circle on my calculator. You have to set it equal to y, and circles are in (x-h)2+(y-k)2 = r2

by Anonymous 12 years ago

I can't graph a circle because there is no r, only x. And I can't write a function with only 2 variables.

by Anonymous 12 years ago

You can graph a circle by using a polar graph, or by rearranging the equation you have there to y=sqrt(r2-(x-h)2)+k and then graphing a positive and negative version (it's a square root so it has two solutions). Since it is a circle is not actually a function because it has 2 y values for 1 x value. By graphing it this way you get to semicircles that make one circle.

by Anonymous 11 years ago

Why would you need to? Cs is negative in the second and third quads. Tan positive in the third and first quads. Common quad is...?

by Anonymous 11 years ago

(Your+name+(optional)): First x is one or three, second is two or three no calc

by Anonymous 12 years ago

There both the same angle, so the correct answer is three, since that is where they overlap.

by Anonymous 12 years ago

(Your+name+(optional)): fair enough, i thought they were two separate problems

by Anonymous 12 years ago

Your substitute anonymous name just makes me angry...

by Anonymous 12 years ago

sometimes doing it mentally is faster.

by Anonymous 12 years ago

What is 165 in pi radians?

by Anonymous 12 years ago

(33/36)π

by Anonymous 12 years ago

The stuff I do in my engineering maths class doesn't allow calculators...so yeah...it is important. Not everyones mathematic abilitie's stop at the times tables.

by Anonymous 12 years ago

Looks like you're wrong on this one!

by Anonymous 12 years ago

I'm guessing you haven't had to factor quadratic functions yet.

by Anonymous 12 years ago

To use your logic, there's no reason to make calculators, people have brains for a reason...

by Anonymous 12 years ago

There's no reason to learn anything. Asians were made for a reason.

by Anonymous 12 years ago

It'd be kinda sad if humans couldn't do stuff like 3x3 in their heads.

by Anonymous 12 years ago

My teacher just told us yesterday. If you don't know maths you can't really make a calculator to solve stuffs that you don't know... If no one knows maths then calculators wouldn't exist. And by the way I hate trigos.

by Anonymous 12 years ago

I mean are you really gonna do simple shit on a calculator? That's so much more effort.

by Anonymous 11 years ago

Someone had to have figured all of the trig numbers without a calculator. My teacher told there was a book with a list of trig numbers.

by Anonymous 11 years ago