## ** TRIGONOMETRIC EQUATIONS - Exercise 4**

Solve the equation . Restrict
solutions to the interval .

Solution: The substitution yields the equation
, which is quadratic in *u*.
We use the quadratic formula
to solve for :

If the calculator gives *x*=1.1191 as the acute
solution, so we deduce that the other solution is
. The equation has no solutions,
since for all *x*. The solution set is therefore
.

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*Luis Valdez-Sanchez *

Tue Dec 3 17:39:00 MST 1996

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