book
Maths Puzzle
Numerical Ability
Multiply. (x^2-x-1)(x^3-x^2+1)
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book Other Question
If angles A, B, and C are the sides of a triangle such that sin(A+B)=1/cosC and cos(A+B)=cosC, then show that the triangle is a right triangle.
cosx+cosy-cos(x+y)=3/2
this is only possible if x=y=60