Question 950272
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Solve the equation for t on the interval [0,2π) 4 cos t - 4 sin t = 4
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        @lwsshar3 in his post gives  3  (three)  possible answers  t = 0,  π/2,  and  3π/2,  without checking.


        This answer is  INCORRECT.


Since both sides of the equation were squared on the way,  the check is needed to test 
if the founded possible solutions really satisfy the original equation.


The test shows that  t = π/2  does not satisfy the original equation.


Therefore, &nbsp;the true solutions are &nbsp;t = 0, &nbsp;3π/2, &nbsp;only. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>ANSWER</U>