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Part 1
Find the angle between the pair of vectors.
left angle1, 3right angle and left angle4, 2righ...
If 2 cos θ = -1/2, cos φ = √3/2, and 2 cos ψ = 1/2, then prove that:
2 cos(θ + φ + ψ) = x √3 + 1/(2√2)
2x+y=20
y=6x+4
35840.42/x^2=260-297720/x^2
x^2+7x- 34.86
, ∀η ∈ Ν : 1·3+2·4+3·5+...+n(n+2)=(n(n+1)·(2n+7))/6
-x^3+50*x^2+2325*x-83500=0
(5r+4)(3r+2)+9(r+2)
12/(2^3/4)^-2+1
5x^2-750x+2000=0
