The numerical value of `tan 225^circ *cot 405^circ + tan 765^circ* cot 675^circ` =______.

The numerical value of tan 20^circ* tan 40^circ* tan 80^circ =______.

The numerical value of sin 6^circ* sin 42^circ* sin 66^circ* sin 78^circ =_____

The numerical value of sin 12^circ* sin 48^circ* sin 54^circ = _______.

The numerical value of cot^(2)36^circ* cot^(2)72^circ =_____.

Prove that tan 20^circ* tan 80^circ = sqrt3 tan 50^circ .

Value of sin(37^circ)cos(53^circ) is

Prove that tan 9^circ - tan 27^circ -tan 63^circ + tan 81^circ = 4 .

The value of (tan 29^circ cot61^circ - cosec^2 61^circ) + (cot^2 54^circ - sec^2 36^circ) + (sin^2 1^circ + sin^2 3^circ + sin^2 5^circ +......+ sin^2 89^circ) is: (tan 29^circ cot61^circ - cosec261^circ) + cot254^circ - sec236^circ +(sin 21^circ + sin 23^circ + sin 25^circ +......+ sin 289^circ) का मान है :

The value of sqrt3 cosec 20^circ - sec 20^circ is equal to

tan 40^circ + 2tan 10^circ is equal to