- How would you simplify 2tan15°/(1-tan^2 15°)?

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If the big bang is how the universe came to be, then what caused the big bang? How does rotating differ from reflecting when the rotation and the refection land in the same place? What do the 4 and 2 signify in 4h2? Please help!!
prove for vector functions (a X b)' = a' X b + a X b'? What is the product of x^2 − 2x + 3 and x + 1?