`cosec10^@-sqrt3 sec 10^@=` `

Evaluate : cosec10^@-sqrt3sec10^@

If lim_(xrarr2) (2x^2-4f(x))/(x-2) =m, where f(2)=2, f'(2)=1, then cosec 10^@-sqrt(3)sec10^@ is (A) 3m (B) 2m (C) m (D) none of these

Calculate the following without using trigonometric tables (i) tan 9^(@) - tan 27^(@) - tan 63^(@) + tan 81^(@) (ii) cosec 10^(@) -sqrt(3) sec 10^(@) (iii) 2sqrt(2) sin 10^(@) [(sec 5^(@))/(2) + (cos 40^(@))/(sin 5^(@))-2 sin 35^(@)] (iv) cot 70^(@)+4 cos 70^(@)

Find the value of cosec 10^(@) - sqrt(3) sec 10^(@) .

Show that sqrt(3)cosec 20^@ - sec 20^@= 4

sqrt3"cosec"20^(@) - sec20^@ =

"cosec" 10^(@) - sqrt(3) " sec" 10^(@) =

The value of cosec 430 ^(@) + sqrt3 sec 470^(@) is :