`sin 47^@ + cos 77^@ = cos 17^@`

Prove that: sin 47^0+cos 77^0=cos 17^0

What is the value of (5 sin 75^@ sin 77^@ + 2 cos 13^@ cos 15^@)/(cos 15^@ sin 77^@) - (7 sin 81^@)/(cos 9^@) ?

(a) Prove that sin65^(@)+cos65^(@)=sqrt(2)cos 20^(@) (b) Prove that sin47^(@)+cos77^(@)=cos17^(@)

(a) Prove that sin65^(@)+cos65^(@)=sqrt(2)cos 20^(@) (b) Prove that sin47^(@)+cos77^(@)=cos17^(@)

(a) Prove that sin65^(@)+cos65^(@)=sqrt(2)cos 20^(@) (b) Prove that sin47^(@)+cos77^(@)=cos17^(@)

What is the value of (sin 19^@)/(cos 71^@) + (cos 73^@)/(sin 17^@) ?

(cos 17^(@) + sin 17^(@))/(cos 17^(@) - sin 17^(@))=

( cos 17^(@) + sin 17^(@))/( cos 17^(@) - sin 17^(@)) = tan 62^(@)

Write True or False : Value of (sin43^@ cos 47^@+ cos43^@sin 47^@) is 2.

(cos 17^(@) + sin 17^(@))/(cos 17^(@) - sin 17^(@))= ................ A) tan 62^(@) B) tan 56^(@) C) tan 54^(@) D) tan73^(@)