The value of `cos1 5^(@)cos7 1^@/2 sin 7 1^@/2` is

The value of cos 15^@ cos 7 1^@/2 sin 7 1^@/2 is:

The value of cos15^(@)cos7(1^(@))/(2)sin7(1^(@))/(2) is

The value of cos 15^(@)cos 7(1^(@))/(2)sin 7(1^(@))/(2) is

The value of cos15^(@)cos(7(1)/(2))^(@)sin(7(1)/(2))^(@) is

The value of cos 15^(@) cos 7 ((1)/(2))^(@)sin 7 ((1)/(2))^(@) is

The value of (sin 1^(@) +sin 3^(@) + sin 5^(@) +sin 7^(@))/(cos 1^(@)*cos 2^(@)sin 4^(@)) is __________

The value of (sin 1^(@) +sin 3^(@) + sin 5^(@) +sin 7^(@))/(cos 1^(@)*cos 2^(@)sin 4^(@)) is __________

The value of (sin 1^(@) +sin 3^(@) + sin 5^(@) +sin 7^(@))/(cos 1^(@)*cos 2^(@)sin 4^(@)) is __________

The value of (sin 1^(@) + sin 3^(@) + sin 5^(@) + sin 7^(@))/( cos 1^(@) .cos2^(@).sin4^(@)) is"________"

The value of cos[1/2cos^(-1)(cos(-(14pi)/5))]\ is/are a. cos(-(7pi)/5) b. sin(pi/(10)) c. cos((2pi)/5)\ d. -cos((3pi)/5)