`(sin7 0^(@)+cos4 0^(@))/(cos7 0^(@)+sin4 0^(@))=`

cos4 0^(@)+cos2 0^(@))=3(cos1 0^(@)+sin2 0^(@)) 40 CUSOUcos 40^@ + cos 20O 4(cos310^@ + sin320^@) = 3(cos 10^@ + sin20^@)N3.1 = 4

Evaluate (2cos4 0^(@)-cos2 0^(@))/(sin2 0^(@)

Evaluate the equation ;- cos 90^(@) sin 0^(@) - sin 0^(@) cos 90^(@) .

Evaluate : [{:(,4 sin 30^@ 2 cos 60^@), (,sin 90^@ 2 cos 0^@):}] [{:(,4,5),(,5,4):}]

" The value of "(sin1^(0)+sin3^(0)+sin5^(0)+sin7^(0))/(cos1^(0)*cos2^(0)*sin4^(0))" is "

Prove that : (cos 20^0 - sin 20^0)/(cos 20^0 + sin 20^0) = tan 25^0

Prove that : (cos 10^0 - sin 10^0)/(cos 10^0 + sin 10^0) = tan 35^0