- Statics,, structural analysis, trusses can anyone answer it pls?

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Is the Law of Attraction pseudo science?
Its based on quantum physics which is far from pseudo science. If it is, why? MATH HELP. Can you do this question? How do I find the value of cos B from: tan B/2, given tan B = -sqrt(11)/5, with pi/2 < B < pi The answer is -5/6, but how do they get it? Help on Probability please!? How do I prove that t is twice the area of the shaded region?