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Answer» my dear the correct FORMULA will be √A^2+B^2+2ABcos theta as the A& B= a so, we can WRITE the formula as 2acos theta /2now, if theta =0 ,than2acos0/2=2acos 0°=2abecause cos0°=1if theta =60°2acos60/2=2acos30°=2a×√3/2=√3aif theta=90°2acos90/2=2acos45°=2a×1/√2=√2aif theta=1202acos120/2=2acos60°=2a×1/2=a..if theta= 180=2acos180/2=2acos90°= 0because cos90°= 0& if we MULTIPLY any number by 0 than the result will be 0I hope you will understandplease like it |
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