Half Angles Formulas
Next you do same,change, flip. . . multiply the bottom and the top by 1/2 so that you get:
Rationalize the denominator.
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Tip: Remember to first write out the formula, then draw a picture, and then find the answer to the question .
You can find more notes on Mr. Corn's web page at here
More Identities. . .
I recommend this one when using tan.
, lies in quadrant III.
Solve for:
Because we are given the tangent we can easily find the cosine-which will help us solve for the problems above.
By using pythagorean we can find the missing side (hypotenuse).
To solve, first find the correct equation to use:
Plug in -15/17 for cosine theta. . .
Make 1=17/17 so that you can add. . .
Next you do same,change, flip. . . multiply the bottom and the top by 1/2 so that you get:
Simplify.
Rationalize the denominator.
Plug in -15/17 . . .
Like before, make 1= 17/17. . .
Multiply the top and the bottom by 1/2 so that you get. . .
Rationalize the denominator. . .
Tip: Remember to first write out the formula, then draw a picture, and then find the answer to the question .
You can find more notes on Mr. Corn's web page at here
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