[" (iii) "sec50^(@)sin40^(@)+cos40^(@)cosec50^(@)=2],[" (iv) "sec70^(@)sin20^(@)-cos20^(@)cosec70^(@)=0]

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

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

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

Without using trigonometric tables, prove that : (i) sin 43^@cos47^@+cos43^@ sin 47^@=1 (ii) cos 38^@cos 52^@-sin 52^@=0 (iii) sec 50^@sin40^@+cos40^@cosec 50^@=2 (iv) sec 70 ^@sin 20^@-cos 20^@-cosec 70^@=0

sec 70^@.sin 20^@ - cos70^@.cosec 20^@

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

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

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

The value of sec70^@sin20^@+cos20^@cosec70^@ is

Evaluate: sec 50^(@) sin 40^(@)+cos 40^(@) cosec 50^(@) .