The expression is .
To find the value of .
(Apply Pythagorean identity)
(Substitute )
(Take the square root of each side)
is in the first quadrant, sin is positive, .
Now find the .
(Apply double-angle formula)
(Substitute and )
(Apply double-angle formula)
(Substitute )
(Apply half-angle formula)
(Substitute )
(Apply half-angle formula)
(Substitute )
The values of , , and .
"I want to tell you that our students did well on the math exam and showed a marked improvement that, in my estimation, reflected the professional development the faculty received from you. THANK YOU!!!" June Barnett |
"Your site is amazing! It helped me get through Algebra." Charles |
"My daughter uses it to supplement her Algebra 1 school work. She finds it very helpful." Dan Pease |