SOLUTION: Is an acute angle and sin 0 is given. Use the Pythagorean identity
sin^2 + cos^2=1 find cos 0
(a) sin 0= (6/7)
(b)sin 0= (sqrt(21))/5
Show work please!
I really need
Algebra ->
Trigonometry-basics
-> SOLUTION: Is an acute angle and sin 0 is given. Use the Pythagorean identity
sin^2 + cos^2=1 find cos 0
(a) sin 0= (6/7)
(b)sin 0= (sqrt(21))/5
Show work please!
I really need
Log On
Question 851076: Is an acute angle and sin 0 is given. Use the Pythagorean identity
sin^2 + cos^2=1 find cos 0
(a) sin 0= (6/7)
(b)sin 0= (sqrt(21))/5
Show work please!
I really need it! Thank you! Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! Is an acute angle and sin 0 is given. Use the Pythagorean identity
sin^2 + cos^2=1 find cos 0
(a) sin 0= (6/7)
(6/7)^2 + cos^2(t) = 1
cos^2(t) = 1-(36/49)
cos^2(t) = 13/49
cos(t) = +/- sqrt(13)/7
===============================
(b)sin 0= (sqrt(21))/5
(21/5)^2 + cos^2(t) = 1
cos^2(t) = 1 - 21/25 = 4/25
---
cos(t) = +/- 2/5
--------------------------
Cheers,
Stan H.
========================
(