- Find cos(2theta), if sin(theta) = 13/85?

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I need to do a project on what happens to the neurons at a microscopical level for ALS. I need a website to explain/show how it works, plz.? Derivation of propositional logic for (p ∨ (q ⊃ q))? According to projectile motion project (ruler and 2 pennies), which penny was is in free fall? In this figure, AB¯¯¯¯¯∥CD¯¯¯¯¯ and m∠1=110°.
What is m∠5? will give best answer ty? Cos^2 x+2cosx+1=0?