Cos пи -sin(-5пи/2)+tg^2 4пи/3

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First, let's simplify each term individually:

cos(pi) = -1
sin(-5pi/2) = 1
tan(4pi/3) = sqrt(3)

Now, plug these values back into the original expression:

-1 - 1 + (sqrt(3))^2
= -1 - 1 + 3
= 1

Therefore, the value of the expression is 1.