The value of `(sin^2 20^@ + cos^4 20^@)/(sin^4 20^@+cos^2 20^@)` is

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

What is the value of (cos 40^@ -cos 140^@)//(sin 80^@ + sin 20^@) ?

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

(2cos 40^0-cos 20^0)/(sin 20^0)=

Write the value of |[sin20^@-cos20^@ ],[sin70^@ cos70^@]| .

The value of sec70^@sin20^@+cos20^@cosec70^@ is

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