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The vertices of a triangle are A(1, 1), ...

The vertices of a triangle are A(1, 1), B(4,5) and C(6, 13) Find cos A.

Text Solution

Verified by Experts

`a=sqrt(68)`
`b=13` `c=5` `Cos(A)= (b^2 +c^2- a^2)/(2*b*c)` `Cos(A)=0.969`
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