Carmen paid $10.50 for a T-shirt at the mall. It was on sale for 30% off. What was the original price before the discount?
1 answer:
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Using the identity:
There are two solutions to this equation:
1)
Since the period of cosine is 2π, so 0 + 2π = 2π will also be a solution to the given equation
2)
Therefore, there are 3 solutions to the given trigonometric equation.