" v) "quad sin^(2)35^(@)+sin^(2)55^(@)

Evaluate: sin^(2)35^(@)-cos^(2)55^(@)

sin^(2)(35^(@))+sin^(2)(55^@) is equal to

The value of cos ( 35^(@) + A)cos ( 35^(@) - B) + sin ( 35^(@) +A)sin ( 35^(@) - B) is equal to (i) sin(A+ B) (ii) sin(A - B) (iii) cos (A+B) (iv) cos(A-B)

Q.exact value of cos20^(@)+2sin^(2)(55)^(@)-sqrt(2)sin65^(@)

The value of cos 20^(@)+2sin^(2)55^(@)-1-sqrt(2)sin65^(@) =

Prove that sin55^(@)-sin19^(@)+sin53^(@)-sin17^(@)=cos1^(@)

Express each as a product sin 75^(@) - sin 35^(@)

Without using Trigonometric Tables evaluate the following :- (sin^2 35^@+sin^2 55^@)/(tan10^@tan20^@tan30^@tan70^@tan80^@) .

Prove that: (i) cos55^(@)sin 35^(@)+sin 55^(@)cos 35^(@)=1 (ii) (tan 72^(@))/(cot 18^(@))-(cot 72^(@))/(tan18^(@))=0 (iii) sec70^(@)sin 20^(@)+cosec 70^(@)cos 20^(@)=2