please answer the ques. (no spamming plzzzz)
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b is ur answer
vector A+ vector B= vector C
therefore
A²+B²+2ABsin x= C².............(I)
now, if B is reversed it means now it is
-B in place of B
so vector A +(- vector B)=vector D
so, A²+B²-2AB sin x=D²..............(II)
adding (I) & (II) we get,
X²+D²=2(A²+B²)
vector A+ vector B= vector C
therefore
A²+B²+2ABsin x= C².............(I)
now, if B is reversed it means now it is
-B in place of B
so vector A +(- vector B)=vector D
so, A²+B²-2AB sin x=D²..............(II)
adding (I) & (II) we get,
X²+D²=2(A²+B²)
aditya127:
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