# Solve each equation for o is less than and/or equal to theta is less than and/or equal to 360 -- sin^2x = 1 = cos^2x -- Work: cos^2x - cos^2x = 0 0 = 0 -- Textbook Answers: 90 and 270 -- Btw, how would you isolate for cos^2x = 0

Solve each equation for o is less than and/or equal to theta is less than and/or equal to 360

--
sin^2x = 1 = cos^2x
--

Work:
cos^2x - cos^2x = 0
0 = 0

--
90 and 270
--

Btw, how would you isolate for cos^2x = 0? Would it be...
x = cos^-1 square root of _____ ?

Hmm... that's tricky. I solved it one way (similar to your method), and it didn't work. Anyway, this works...

(1) Subtract the cos^2(x) from both sides.
(2) Substitute "1 - sin^2(x)" in for cos^2(x). That comes from the #1 Identity: sin^2(x) + cos^2(x) = 1.
(3) Simplify and factor.

You should get the right answer that way. Let me know if you run into any problems.
Should this be...

sin^2x - 1 = cos^2x ??

Your equation has two equal signs.
Yeah it should be, sorry for the typo
##### Add Answer of: Solve each equation for o is less than and/or equal to theta is less than and/or equal to 360 -- sin^2x = 1 = cos^2x -- Work: cos^2x - cos^2x = 0 0 = 0 -- Textbook Answers: 90 and 270 -- Btw, how would you isolate for cos^2x = 0
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