Monday

March 2, 2015

March 2, 2015

Posted by **Anonymous** on Saturday, November 24, 2007 at 4:48pm.

--

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? Would it be...

x = cos^-1 square root of _____ ?

- Math - Solving Trig Equations -
**Michael**, Saturday, November 24, 2007 at 5:29pmShould this be...

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

Your equation has two equal signs.

- Math - Solving Trig Equations -
**Anonymous**, Saturday, November 24, 2007 at 5:31pmYeah it should be, sorry for the typo

- Math - Solving Trig Equations -
- Math - Solving Trig Equations -
**Michael**, Saturday, November 24, 2007 at 5:37pmHmm... 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.

**Answer this Question**

**Related Questions**

Math - Solving for Trig Equations - Solve the following equation for 0 less than...

Precalculs - I have no idea how to do these type of problems. -------Problem...

Math - Solving Trig Equations - Solve each equation on the interval: 0 is less ...

Precalc with Trig - What value(s) of theta (0 less than or equal to theta less ...

Trigonometry - Thank you STEVE!!!!! Suppose that Cos (theta) = 1/square root 2 ...

Math Trig Help - sin theta = x/3, with theta in the first quadrant, find the ...

trig - What are the values of theta in the interval 0 less than or equal to ...

trig - given that 0 is less then or equal to theta and theta is less then or ...

algebra 2 and trig (math) - Find the value of x in the interval 0 is less than ...

trig - e.g. tan 315 = -1, does that work in our equation ?? Yes, thank you again...