" (xi) "sec50^(@)sin40^(@)+cos40^(@)cosec50^(@)

Evaluate the following : sec50^(@)sin40^(@)+cos40^(@)cosec50^(@)

Evaluate: sec 50^(@) sin 40^(@)+cos 40^(@) cosec 50^(@) .

Without using Trigonometric Tables evaluate the following :- (sec50^@sin40^@+cos40^@cosec50^@)

Without using trigonometric tables, prove that : (i) sin 43^@cos47^@+cos43^@ sin 47^@=1 (ii) cos 38^@cos 52^@-sin 52^@=0 (iii) sec 50^@sin40^@+cos40^@cosec 50^@=2 (iv) sec 70 ^@sin 20^@-cos 20^@-cosec 70^@=0

Without using trigonometric tables, evaluate: (tan 50^(@)+sec50^(@))/(cot40^(@)+cosec40^(@))+cos 40^(@)cosec 50^(@)

Evaluate : sin50^(@)cos40^(@)+cos40^(@)+cos50^(@)sin40^(@)

Evaluate : sin50^(@)cos40^(@)+cos40^(@)+cos50^(@)sin40^(@)

Evaluate the following: (i) sec50^osin40^o + cos40^o\ cos e c\ 50^o (ii) sec70^osin20^o-cos20^o\ cos e c\ 70^o

Solve the following/ निम्नलिखित को हल कीजिए : (sin 40^@)/(cos 50^@)+ (cosec 50^@)/(sec 40^@)-4 cos50^@ cosec40^@