I need help with part b. Part a is 3/5

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secondary 4 E Maths Singapore

I need help with part b. Part a is 3/5

Date Posted: 3 years ago

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a)
https://www.mathsisfun.com/algebra/vectors-dot-product.html
b)
https://www.mathsisfun.com/algebra/trig-cosine-law.html

Date Posted: 3 years ago