Question

If sin θ = 21/29 , use the Pythagorean Identity to find cos θ.

Answer 1

\[\cos \theta = \sqrt{1 - \sin \theta ^{2}}\]

Answer 2

i thought i needed to use sin^2+cos^2=1?

Answer 3

oh wait thats the same thing isnt it....

Answer 4

they are the same

Answer 5

just draw a triangle



find x using pythagoras then you can find the cos ratio

Answer 6

i got now thx