Posted by lola on Monday, January 16, 2012 at 7:11pm.
How do I get exact measures?
cosine 270 degrees
sin 90 degrees
tan 360 degrees
csc 45 degrees
no calculator!

trig  MathMate, Monday, January 16, 2012 at 7:45pm
The best way to solve these problems is to draw a unit circle (radius = 1), and calculate these ratios from the definitions (cosine = adjacent / hypotenuse, etc.)
The first three can be solved easily this way. The last one,
csc(45°)=1/sin(45°)
Knowing that sin(45)=cos(45), and
sin²(45)+cos²(45)=1, we solve for sin(45)=(√2)/2, so
csc(45)=2/√2 = √2.
Answer This Question
Related Questions
 Algebra II  Multiple Choice (theta) means the symbol 0 with the dash in it. 1.)...
 Calculus  Find the exact values of the following. cos 270 degrees = 90 degrees...
 Trigonometry  Solve the equation cos^2A = sin^2A + sinA when 0¨¬¡A¡360¨¬. ...
 Trigonometry  Please review and tell me if i did something wrong. Find the ...
 trig  on the same set of axes: (0 degrees is greater than or equal to x and x ...
 Trig  What is the exact value of cos 40 degrees cos 50 degrees minus sin 40 ...
 trig  How do you express in terms of angles less than 90 degrees? sin 120 ...
 Math  1. Find the value of Sin^1(1/2) a. 30 degrees b. 30 degrees c. 150 ...
 Trig  Can someone check my answers so far? 1. Find the exact value of tan(3ð) ...
 math  find the exact value of [sec(30 degrees) cot 120 degrees]/1cosec^2(45 ...
More Related Questions