I do not understand what to do for these problems. I am very lost can someone show me how to do one of these.
And I copied and pasted my homework on here so I didnt mess up the instructions or problem(s).
Use a sum or difference formula or a half angle formula to determine the value of the trigonometric functions. Give exact answers. Do not use decimal numbers. The answer should be a fraction or an arithmetic expression. If the answer involves a square root it should be enter as sqrt; e.g. the square root of 2 should be written as sqrt(2);
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..reference angle
now use the half angle formula for sine.
.......since sine is an odd function=
now use the addition formula for sine
Icemanfan responded to this.=
do a similar manipulation as i did with the first, and use the half angle formula for cosine.=
WARNING: since cosine is an even function. this makes an important difference in what i did in the first problem
I wouldn't have asked if I had not been looking for it. And I did type it in google, which only shows either double half angles(?) and examples. It doesn't explain how it works or is solved. & instead of wasting time to type that, you could of given me a reference or explaination. its more helping than telling.
4. Half Angle Formulas ...it also shows how they are derived