[" Tere "],[qquad (5)/(3)tan13^(@)tan37tan45^(@)tan53^(@)tan77]

Prove that (2)/(3)csc^(2)58^(@)-(2)/(3)cot58^(@)tan32^(@)-(5)/(3)tan13^(@)tan37^(@)tan45^(@)tan53^(@)tan77^(@)

What is the value of ( cosec (78^(@) - theta) - sec ( 12^(@) + theta) - tan (67^(@) + theta) + cot (23^(@) - theta) )/( tan 13^(@) tan 37^(@) tan 45^(@) tan 53^(@) tan 77^(@) ) ?

Without using trigonometric tables,evaluate each of the following: (2)/(3)cos ec^(2)58^(@)-(2)/(3)cot58^(@)tan32^(@)-(5)/(3)tan13^(0)tan37^(0)tan45^(@)tan53^(@)tan77^(0)

Prove that : (2)/(3)cosec^2 58^@-(2)/(3) cot 58^@tan 32^@ -(5)/(3)tan 13^@tan 37^@tan 45^@tan 53^@tan 77^@=-1 .

Find tan15^(@).tan25^(@).tan45^(@).tan65^(@).tan75^(@) .

Evaluate: tan35^(@)tan40^(@)tan45^(0)tan50^(@)tan55^(@)

tan(45^(@)+A)tan(45^(@)-A)=1

What is the value of (cosec(78^@+ theta)-sec(12^@-theta)-tan(67^@+ theta)+cot(23^@-theta))/(tan13^@ tan37^@ tan45^@ tan53^@ tan77^@) ? (cosec(78^@+ theta)-sec(12^@-theta)-tan(67^@+ theta)+cot(23^@-theta))/(tan13^@ tan37^@ tan45^@ tan53^@ tan77^@) का मान क्या होगा ?

Evaluate the ((3 cos 43^(@))/(sin 47^(@)))^(2) - (cos 37^(@) "cosec" 53^(@))/(tan 5^(@) tan 25^(@) tan 45^(@) tan 65^(@) tan 85^(@))

tan225^(@)=tan(180^(@)+45^(@)) =tan45^(@)=1