Question

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

Answer 1

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

Answer 2

adj / hyp

Answer 3

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

Answer 4

on that triangle, which side is hypotenuse?

Answer 5

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

Answer 6

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

Answer 7

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

Answer 8

don't get??

Answer 9

oh a2 + b2 = c2

Answer 10

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