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March 28, 2015

March 28, 2015

Posted by **HELPPPP** on Thursday, May 20, 2010 at 9:24pm.

- HELPPPPPPP (TRIG) -
**Reiny**, Thursday, May 20, 2010 at 10:34pmFor this and the others you must know your basic identities.

In this case

sinx = 3cos^2x

sinx = 3(1-sin^2x)

3sin^2x + sinx - 3 = 0

by the formula

sinx = .84713 or some number < -1, which is not possible

if sinx = .84713 (x in I or II)

x = 57.9006° or 122.099°

x = 57° 54' or 122° 6'

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