for 2 real vectors a and b prove that (vector a + vectorb)²= vector a²+ vector b²+2ab
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Answer:
a x b= a b sin∅ .n, where a=lal and b=lbl
(а х b)² = a² b² sin² (n)² = a² b² sin²∅
a²b²(1-cos²∅)=a² b² - a² b² cos²∅
lal² lbl² -(a.b)²
(∵ (n)²=1)
Step-by-step explanation:
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