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**skylor****Guest**

Use an identity to solve each equation on the interval (0,2pi)

2cos^2x+sin x -1 = 0

**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 7,444

hi skylor

You can use

to eliminate the** cos** from the expression and make a quadratic in **sin.**

Bob

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