- Why does (1+sinx)+(1-sinx) =2?

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How much does a box of 500 business cards weigh? Solve the equation 2cos(x+7pi/4)= square root of 3 ,which lie in [0,2pi) .find smallest and largest solution. Please show details ! Thanks? Ho wma y kilometers run after 22 minutes? Find a basis of the subspace of R4 that consists of all vectors perpendicular to both [1,0,0,7] and [0,1,-9,5]. Please show work!? How can rates be converted to unit rates?