- #1

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## Homework Statement

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

Solve for x

## Homework Equations

## The Attempt at a Solution

I don't really know how to start. I know cos^2x+sin^2x=1 but I don't think I can apply that with the 2 thrown in there.

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- Thread starter Wessssss
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- #1

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

Solve for x

I don't really know how to start. I know cos^2x+sin^2x=1 but I don't think I can apply that with the 2 thrown in there.

- #2

SteamKing

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Observe: cos^2 + 2 sin^2 = (cos^2 + sin^2) + sin^2

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thank you

- #4

HallsofIvy

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