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Find all solutions to the equation.
cos^2x + 2 cos x + 1 = 0 (4 points)

Find all solutions to the equation. cos^2x + 2 cos x + 1 = 0 (4 points)-example-1
User Grillp
by
8.1k points

1 Answer

9 votes

Answer:

cos^2x + (1+1)cos x + 1 = 0

or,cos^2x + cos x + cos x + 1 = 0

or,cos x(cos x + 1) + 1 (cos x + 1) = 0

or, (cosx + 1) + (cosx + 1) = 0

either

cosx + 1 =0 or cosx +1 =0

User Bandula Dharmadasa
by
8.0k points

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