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If tan A =1,and tan b …

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If tan A =1,and tan b =root of 3 evaluate cos a cos b-sina sinb
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Sri Shivani Sankar 5 years, 9 months ago

Tan a =1 A=45 Tan b=root 3 B=60 To evaluate cos a cos b -sin a sin b Substituting value of a and b Cos 45 cos 60 - sin 45 sin 60 1/root 2 * 1/2 - 1/root 2 * root 3/2 root 2 =1- root 3 /2 root 2
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