If `cos 20 - sin 20 = p`, then cos 40 is equal to

If cos20-sin20=p, then cos40 is equal to

The smallest positive value of x (in degrees) for whichcos tanx=(cos5^@ cos 20^@ + cos 35^@ cos 50^@-sin 50^@ sin 20^@ - sin35^@ sin50^@)/(sin5^@ cos 20^@ - sin 35^@ cos 50^@ + cos 5^@ sin 20^@ - cos 35^@ sin 50^@) is equal to

The smallest positive value of x (in degrees) for whichcos tanx=(cos5^@ cos 20^@ + cos 35^@ cos 50^@-sin 50^@ sin 20^@ - sin35^@ sin50^@)/(sin5^@ cos 20^@ - sin 35^@ cos 50^@ + cos 5^@ sin 20^@ - cos 35^@ sin 50^@) is equal to

The value of cos 10^@. Cos 20^@. Cos 40 ^@ is equal to

Given that cos20^(@)-sin20^(@)=p , then what is the value of sin 40^(@) ?

If sin theta = cos (20^(@)+theta) , then theta is equal to :

The value of cos 20^(@) cos 40^(@)cos 60^(@) cos 80^(@) is equal to