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What is the first digit of Graham's Number? Electromagnetic induction occurs when what? What is [1/cos(x)-sin(x) times tan(x)]/cosĀ²(x)? If a and b are roots of equation x^2 +x -12 =0 such that a>b then equation whose roots are 2a and 3b is ?Please!? Calculate stress and strain in round bar 12mm in diameter and 150mm long with tensile force of 400N acting on it?