Question

sin 10 cos 20 tan 40 tan 50 cos 70 sec 80

Answer 1

sin 10 cos 20 tan 40 cot 40 sin 10 cosec 10
sin10 cos20
1/2 x 2cos20 sin10
1/2 [ Sin 30 - Sin 10 ]

Answer 2

Answer

Tan 50 + sen 20 / cos 50 cos 70