Posted by bandit5571 on Tuesday, January 11, 2011 at 11:02pm.
solve the equation
- pre calc - bandit5571, Tuesday, January 11, 2011 at 11:05pm
without a graphing utility
- pre calc - Reiny, Wednesday, January 12, 2011 at 12:08am
1+4sinx = 4(1 - sin^2 x)
4sin^2 x + 4sinx -3 = 0
(2sinx - 1)(2sinx + 3) = 0
sinx = 1/2 or sinx = -3/2
the last part is not possible since sinx is between -1 and +1
so sinx = 1/2
x must be in quadrants I or II
I know sin 30° = 1/2
so x = 30° or 150°
x = π/6 or x = 5π/6
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