start with this equation:
π radians = 180°
now divide this by simple whole numbers
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°
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 , (180-45 = 135°)
sin 3π/4 = .707106781... = √2/2
Answer this Question
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) = ...
Calculus grade 12 - solve for (<_ = less than or equal to / pie = pie sign...
trig - i can not figure out how to write the complex number in rectangular form ...
math - evaluate the expressions below and leave them in radical form. 1. sin(pie...
Calculus - If water is poured into a cup at a rate of 1 cubic centimeter per ...
math - find the exact value of cos(-pie/3)+ sin (-7pie/4)
Algebra II - Multiple Choice (theta) means the symbol 0 with the dash in it. 1.)...
trig - use a sum or difference identity to find an exact value cos pie/12