Determine the type of each mathematical sentence. Write OPEN if it is open and CLOSED, if otherwise. a2 + b2 = c2 3y = 0 sin2 x + cos2 x = 1 x2 + 2xy + y2 = (x + y)2 x − x = 5

Q: 3tan z sec? x dr 2.

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Q: Simplify this expression. а. 3D - (D - d) b. i– (2 – 3i2) + iz 4 B+a+ 2B 3 - 2 4 B 3 - С. | 3

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