Sin20 COS 70° hi Hot &T

Prove that: (cos^2 20° + cos^2 70°)/(sin^2 20° + sin^2 70°) +sin^2 64° + cos 64° sin 26°=2 .

sec 70^@.sin 20^@ - cos70^@.cosec 20^@

sin 70^@ - cos 40^(@) =

The value of sin20^@ cos70^@+ sin70^@ cos20^@ is: sin20^@ cos70^@+ sin70^@ cos20^@ का मान क्या होगा ?

The value of (sin 20^(@) cos 70^(@)+sin70^(@) cos 20^(@) ) is ……….. .

Without using Trigonometric Tables evaluate the following :- sec70^@sin20^@-cos20^@cosec70^@ .

The value of sec 70^@.sin 20^@ + cos 20^@.cosec 70^@ =………..

Find sin 20^@ -cos 70^@ .

The value of (sin 20^(@)cos70^(@)+ cos20^(@)sin70^(@))/(sin23^(@)"cosec"23^(@)+cos23^(@)sec23^(@)) is _________.

sin 10^(@)+sin 20^(@) + sin 40 ^(@) + sin 50 = A) sin 15^(@) +sin 75^(@) B) cos 15^(@) + cos75^(@) C) sin 70^(@) + sin 80^(@) D) cos 70^(@) + cos 80^(@)