- How do I solve: cos2x+sin^2x=0?

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How do you factor completely? 25x^2-81 and 4x^2-7x+2? A(0,3), B(4,1) C(-2,-1), D(7,7) E(1,-1) 1. Which pair of lines are perpendicular?
2. And equation of line AC in slope-intercept form is ? What would be the worst thing to hear as you are going under anesthesia before heart surgery? Quick math help Please? Find the sum of the indicated number of terms of the geometric sequence.
10, 4, 8/5, ...; n = 5?