Without using trigonometric tables, prov...

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`

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