Posted by ALISON on Thursday, September 15, 2011 at 10:27pm.
how do i find the exact value of s
[pie/2, pie]
sin s = radical2/ whole number 2
what is s in radians?
how do i figure this out without the use of a calculator. I drew the graph and located it in the second quadrant and i think the triangle is a 454590 but i don't how to find the radians for the sin of s.

Trig  Reiny, Thursday, September 15, 2011 at 11:42pm
start with this equation:
π radians = 180°
now divide this by simple whole numbers
e.g.
divide by 2 > π/2 = 90°
divide by 3 > π/3 = 60°
divide by 4 > π/4 = 45°
divide by 5 > π/5 = 36
divide by 6 > π/6 = 30°
divide by 8 > π/8 = 22.5°
etc.
copy this chart into a handy place in your notebook.
you know that the sine is positive in the first and 2nd quadrant.
Since s of sin s in in the second quadrant,
s = π  π/4 = 3π/4 , (18045 = 135°)
check:
sin 3π/4 = .707106781... = √2/2
Answer This Question
Related Questions
 calculus  Hi i have two questions: what is the exact value of cos 5(pie)/12? ...
 physics  The motion of a particle is described by x = 10 sin (piet +pie/2 ). At...
 maths  Choose the two options which are true for all values of x 1) cos (x) = ...
 PreCalc  Hi, Find the exact value of the following expression: Sin^1(1/...
 trig  i can not figure out how to write the complex number in rectangular form ...
 trig  secx=5 use a graph to solve the following equation in the interval x is ...
 math  evaluate the expressions below and leave them in radical form. 1. sin(pie...
 trig  use a sum or difference identity to find an exact value cos pie/12
 trig identies 5.3 &5.4  use a sum or difference identity to find an exact value...
 Trig  Use the half angle formula to find the exact value of tan 7 pie/8
More Related Questions