Question

if cos theta =-4/7 what are the values of sin theta and tan theta

Answer 1

i did it halfway through but stuck at the fraction part

Answer 2

What method are you trying to use?

Answer 3

sin 2 theta + cos 2 theta = 1

Answer 4

So, you have:
\[\sin^2(\theta) + (\frac{4}{7})^2=1?\]
What is
\[(\frac{4}{7})^2\]

Answer 5

yes and then i got sin 2 theta + 16/49

Answer 6

I subtract on both sides but i dont know how to subtract fraction from whole

Answer 7

Here's a clue:
\[1=\frac{49}{49}\]

Answer 8

hmmmm

Answer 9

1/49?

Answer 10

ive never seen that b4 lol

Answer 11

\[\frac{49}{49} - \frac{16}{49} = \frac{49-16}{49}\]

Answer 12

So,
\[\sin^2(\theta) = \frac{33}{49} \rightarrow \sin(\theta) = \frac{\sqrt{33}}{\sqrt{49}} = \frac{\sqrt{33}}{7}\]

Answer 13

Ohh okay I see! Ok Ill tell u wat my final answer is

Answer 14

sin theta will be sine theta =+/- sqrt 33/7

Answer 15

can u help with one more. Its very confusin

Answer 16

@ddcamp