sinx+siny=a and cosx+cosy=b then prove cos(x+y)=b^2-a^2/a^2+b^2
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f sinx+siny=a and cosx+cosy=b, then cos(x-y) is equal to 1,2(a^2+b^2-2)(B)1,2(a^2+b^2+2) ... If sinx+siny=a and cosx+cosy=b, then cos(x-y) is equal to 12(a2+b2-2)(B)12(a2+b2+2). 34.4 K. like. 25.8 K ... If `x+y+z=pi/2,` then prove that. play.
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