Find the angle between i + 5j and 5i - J
...Find the angle between i + 5j and 5i - J
0o
45o
60o
90o
Correct answer is D
a = i + 5j and b = 5i - j
cosθ = a.b|a|.|b|
= (1×5)+(5x−1)(√12+52)(52+(−1))2
= 5−5√26×√26 = 0
x = cos−1(0), x = 90o
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