3. cos ( A-B) =cos A cos B + sin A sin B
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What you want to ask is not clear still I give you verification
Let A=60&B=30
Cos(60-30)=cos30=root3/2
And cos60cos30+sin60sin30 =root3/2
Hence verified
Let A=60&B=30
Cos(60-30)=cos30=root3/2
And cos60cos30+sin60sin30 =root3/2
Hence verified
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