Question

What is the value of -cos nπ

Answer 1

⭐hey mate!!

=) value of cos nπ depends on the value of n whether it is even or odd.

=> when n is even its value is 1

=> when value is odd its value is -1

so combining both ..

=> cos nπ = ( -1 ) ^n

so -cos nπ = -( -1 ) ^n

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⭐Thanks