Without using trigonometric tables, evaluate :
(i) `cos 48^@-sin42^@`
(ii) `cosec31^@-sec59^@`
(iii) `cot 34^@-tan56^@`
(iv)` cos^2 13^@-sin^2 77^@`

Evaluate:(iii) Cos48^@-Sin42^@

Without using trigonometric tables, evaluate : (i) (sin16^@)/(cos 74^@) (ii) (sec 11^@)/(cosec 79^@) (iii) (tan 27^@)/(cot 63^@) (iv) (cos 35^@)/(sin 55^@) (v) (cosec 42^@)/(sec 48^@) (vi) (cot 38^@)/(tan 52^@)

Without using Trigonometric tables, evaluate:- 2(cos67^@)/(sin23^@)-(tan 40^@)/(cot50^@)-sin90^@ .

Without using Trigonometric tables, evaluate:- (cos^2 20^@+cos^2 70^@)/(sin^2 59^@+sin^2 31^@) .

Without using Trigonometric Tables evaluate the following :- (sec50^@sin40^@+cos40^@cosec50^@)

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

Without using trigonometric tables , evaluate : (i) (sin11^(@))/(cos79^(@)) (ii) (sec15^(@))/("cosec"75^(@)) (iii) (tan54^(@))/(cot36^(@)) (iv) (cos68^(@))/(sin22^(@)) (v) ("cosec"24^(@))/(sec66^(@)) (vi) (cot18^(@))/(tan72^(@))

Without using trigonometric tables , evaluate : (i) (sin11^(@))/(cos79^(@)) (ii) (sec15^(@))/("cosec"75^(@)) (iii) (tan54^(@))/(cot36^(@)) (iv) (cos68^(@))/(sin22^(@)) (v) ("cosec"24^(@))/(sec66^(@)) (vi) (cot18^(@))/(tan72^(@))

Evaluate : (cos80^@)/(sin10^@)+cos59^@ cosec31^@ .