Find the value of cos0.cos1.cos3......cos90.

Find the value of : cos 210^0

The value of cos1^o.cos2 ^o.cos3^o.....cos179^o is equal to

Find the value of : cos 1395^0

Find the value of : cos^(-1)(cos 13)

Find the value of : cos^(-1)(cos 4)

The value of cos1^@. cos2^@. cos 3^@....cos 179^@= a. 1/sqrt2, b.0, c.1, d.-1

If triangleABC , if cot A+cotB+cotC=0 then find the value of cos A cos B cos C .

Write the value of cos1^0+cos2^0+cos3^0++cos 180^0dot

The value of cos1^@cos2^@cos3^@ ....................................... cos180^@ is (a) 1 (b) 0 (c) -1 (d) None of these

Find the value of cos12^0+cos84^0+cos156^0+cos132^0