" (i) "sin70^(@)sin20^(@)-cos20^(@)cos" ec "70^(@)

sec70^(@)sin20^(@)+cos20^(@)"cosec"70^(@)=?

sec70^(@)sin20^(@)+cos20^(@)cosec70^(@)=2

Evaluate : (i) cosec 82^(@)-sec8^(@) (ii) sec 70^(@)sin 20^(@)+cos 20^(@)cosec 70^(@)

Evalute (g) sec70^(@)sin20^(@)-cos70^(@)cosec20^(@)

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

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

cos70^(@)+sin40^(@)=

cos70^(@)+sin40^(@)=

Prove that (i) sin 70^(@) cos 10^(@) -cos 70^(@) sin 10^(@) =(sqrt(3))/(2) (ii) cos 50^(@) cos 10^(@) -sin 50^(@) sin 10^(@) =(1)/(2) (ii) cos 80^(@) cos 20^(@) + sin 80^(@) sin 20^(@) =(1)/(2) (iv) sin 36^(@) cos 9^(@) + cos 36^(@) sin 9^(@) =(1)/(sqrt(3))

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