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| 1. |
If tan A =1,and tan b =root of 3 evaluate cos a cos b-sina sinb |
| Answer» Tan a =1A=45Tan b=root 3B=60To evaluate cos a cos b -sin a sin bSubstituting value of a and bCos 45 cos 60 - sin 45 sin 601/root 2 * 1/2 - 1/root 2 * root 3/2 root 2=1- root 3 /2 root 2 | |