Given sin (theta) = 21/29... find sin cos and tan (2 theta)

Question

loser66 · Answer

$sin(\theta)=\dfrac{opposite}{hypotenuse}$
how about cos(theta)?

anonymous · Answer

adj / hyp

loser66 · Answer

ok, let them there. Now, pythagorean |dw:1435110885323:dw|
Can you put numbers on the triangle?

loser66 · Answer

on that triangle, which side is hypotenuse?

anonymous · Answer

left side is hyp bottom is adj and right side is opp

loser66 · Answer

you use draw box below, click on it, then a box will pop up. On the right corner, you will see "copy previous drawing", click on it, then scroll up to see my picture, click it to get the pic, then put the numbers in, then post

loser66 · Answer

|dw:1435111234190:dw|

loser66 · Answer

hence, the adj side can be calculated by Pythagorean. Do you know him?

loser66 · Answer

don't get??

anonymous · Answer

oh a2 + b2 = c2

loser66 · Answer

Mr. Pythagore said : In this case, $adj = \sqrt{29^2-21^2}=??$