Without using trigonometric tables, prove that :   `(i) sin 43^@cos47^@+co
Channel: Doubtnut
Date: 2020-04-12

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`