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Trigonometry

Solve the equation for the interval [0, 2л). sin^2 x - cos^2 x = 0 Which is the correct answer?

x = л/4, л/3
x = л/4, 3л/4, 5л/4, 7л/4
x = л/4
x = л/4, л/6

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This provides a solution for a trigonometric equation.

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