- How to verify this trig identity? # 45 and 47?

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A partir de qual atividade o homem relacionava-se com o tempo durante o tempo medieval? 7^(x+1) + 7^x + 7^(x-1) = 399, what is x? If a+b+c=4, ab+ac+bc=6, and abc=3, what is 1/a + 1/b + 1/c? Number Theory: Find the roots of 4x^2+6x+1 in Z11 (could you please explain step by step? THANKS!)? Current in a circuit increases linearly from 0 to 5A over 5 second total charge flowing through cicuit over duration is seniors plz give ans?