Question

Hello. I am having problem in a problem set. I need to solve this type of questions (not same numbers):
cos( 135° )
sin(90°)
tan( 135° )
sec( 30° )
cot( 60° )
csc( 30° )

How do I solve this without any other data (each one is independent), and without calculator? (please step by step, so i can solve the problems alone)

Answer 1

Help please?

Answer 2

the unit circle

Answer 3

Yeah, these aren't really "solving" problems, these are all just common values that people either look up or remember after a while.

Answer 4

http://www.mathsisfun.com/geometry/images/circle-unit-304560.gif

Answer 5

youll have to memorize this later anyways

Answer 6

But I don't want to just memorize them, I want to understand them. How do you take each value?

Answer 7

you treat it as a triangle with a hypotenuse of 1. each 1/4 of the unit circle is split up into 3 triangles. youll have to memorize the lengths of the legs of the triangle

Answer 8

Ok, thanks

Answer 9

Yeah, there's a bit of memorization to it no matter what really. I personally remember it in a unique way without using the triangles, but many people use triangles.