(sin20)/(cos70)

Evaluate the following: (i) (sin20o)/(cos70o)( ii) (cos19o)/(sin71o)

Prove that: (sin70o)/(cos20o)+(cos ec20o)/(sec70o)-2cos700cos ec20o=0

prove that (cos20-sin20)/(cos20+sin20)=tan25

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

Prove that: (sin70^@)/(cos20^@)+(cos e c\ 20^@)/(sec70^@)-2cos70^@\ cos e c\ 20^@=0

Without using trigonometric tables.Find the value of (cos70)/(sin20)+cos57*cos ec33-2cos60

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

(sin70^(@))/(cos20^(@))+(csc20^(@))/(sec70^(@))-2cos70^(@)csc20^(@)=0

(cos70^(@))/(sin20^(@))+(cos59^(@))/(sin31^(@))=8sin^(2)30^(@)