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

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Reduce power to the 1st powers of sin(nx) and cos (mx): cos^4 (x) =? Find the area of the region between the curves x=1−y2 and x=y2−1. I'm a little confused because of the x= not y= and still can't figure it!? Ho wma y kilometers run after 22 minutes? Calculus help? limit as x approaches negative infinity of (sqrt(9x^2+x)) -3x? 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!?