" sin "70^(@)*sec20^(@)=1

sin20^(@)(4+sec20^(@))=

The value of 3sin70^(@)sec20^(@)+2sin49^(@)sec51^(@) is…………….

Find the value of "cosec"70^(@)-sec20^(@)

Find A if sin20^(@)tanAsec70^(@)=sqrt(3)

sqrt(3)" cosec "20^(@)-sec20^(2)=?

Without using trigonometric tables, prove that sec70^(@)sin 20^(@) + cos 20^(@) cosec 70^(@)=2 .

|["cos"70^(@), "sin"20^(@)], ["sin"70^(@), "cos"20^(@)]|=?

sin 20^(@) (4 + sec 20^(@)) =

Prove that: (i) cos55^(@)sin 35^(@)+sin 55^(@)cos 35^(@)=1 (ii) (tan 72^(@))/(cot 18^(@))-(cot 72^(@))/(tan18^(@))=0 (iii) sec70^(@)sin 20^(@)+cosec 70^(@)cos 20^(@)=2