- X(2x+5) x(2x+5)?

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Prove if there is identity cos 2x / (1 + sin 2x) = (cot x - 1) / (cot x + 1)? Determine o cosseno do ângulo da reta (r): X=(2,0,1) + t (-1,-2,-2) com a reta definida pelos pontos A(4,0,-1) e B(-2,-3,1).? Where can i buy sodium phosphate? The density of a gas is 1.16 g/l at STP. What is the molar mass of this gas? I need help with this math problem it seems simple but im confused.?