Establish the identity.(cos ? + sin ?)2 + (cos ? - sin ?)2 = 2(cos2? + sin2?)
What will be an ideal response?
(cos ? + sin ?)2 + (cos ? - sin ?)2 
Mathematics
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Translate the sentence to an algebraic inequality.The cost is less than or equal to $859.97.
A. x ? 859.97 B. x < 859.97 C. x > 859.97 D. x ? 859.97
Mathematics
Use Pascal's triangle to expand the binomial.(x - 3)4
A. x4 - 12x3 + 54x2 + 12x + 81 B. x4 - 12x3 + 54x2 - 108x + 81 C. x4 - 3x3 + 54x2 - 54x + 81 D. x4 - 12x3 - 54x2 - 108x + 81
Mathematics
Find the missing parts of the triangle. 
If necessary, round angles to the nearest degree and give exact values of side lengths.
A. B = 90°, C = 60°, b = 6
B. no such triangle
C. B = 60°, C = 90°, b = 6
D. B = 60°, C = 90°, b = 6
Mathematics
Solve the system of equations. x -y + 4z = 14x+ z = 0 x + 5y +z = -5
A. (0, -1, 0) B. (-1, 0, 0) C. (0, -1, 1) D. (0, 0, -1)
Mathematics