If (1+sina)(1+sinb)(1+sinc)=(1-sina)(1 -sinb)(1-sinc)=k then value of k=? a. (cosacosbcosc) b.(sinasinbsinc) c. (3sinasinbsinc),

k = (1+sina)(1+sinb)(1+sinc) = (1-sina)(1-sinb)(1-sinc) Multiply both entities, k x k = (1+sina)(1+sinb)(1+sinc) x (1-sina)(1-sinb)(1-sinc) That gives k^2 = (1 - sin^2a)(1 - sin^2b)(1 - sin^2c) k^2 = (cos^2a) x (cos^2b) x (cos^2c) k = sqrt ((cos^2a) x (cos^2b) x (cos^2c)) k = cosacosbcosc option a is correct.

The answer of the above question is

You must find the surface of the block therefore 98187 dived by 5628 = 583m squared