Asked by Melissa
Solve the equation (x+3)(x-3) = -9. What are the solutions to the equation if you replace x first with sinx and then with cosx, where 0≤x≤2pi?
Answers
Answered by
Damon
x^2 - 9 = -9 ??
x^2 = 0
sin^2 x = 0
x = 0 or 180 degrees
cos^2 x = 0
x = 90 or 270 degrees
x^2 = 0
sin^2 x = 0
x = 0 or 180 degrees
cos^2 x = 0
x = 90 or 270 degrees
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