Convert the angles of `75^@` and `135^@` into radian

Write the value of tan 75^@ .

Find the values of tan 15^@ and tan 75^@

Convert the angles of (2pi)/3 radian and (11pi)/12 radian into degree.

If the arcs of same length in two circles subtend angles of 60^@ and 75^@ at their centres. Find the ratio of their radii.

The measures of the angles of a triangle are in A.P. If the greatest angle is double the least angle, express the angles of the triangle in degree and radian.

Convert Ethene into ethane-1, 2-dioI

Find the values of sin 15^@ , cos 15^@ and hence deduce the values of sin 75^@ and cos 75^@

Convert Benzene into benzoic acid

Convert the number 970 of decimal system in to a system, where the numeration is based on five. In other word convert the number 970 of decimal system into the quinary system of numeration.