Cos(2θ) = cos²θ - sin²θ = (1-sin²θ)-sin²θ = 1-2(7/9)^2 = -17/81
Answer:
A
Explanation:
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<span>-What equation can be used to solve this work problem?
t/30 + t/20 = 1
</span><span>-How many minutes will it take both hoses to fill the pool?
12 minutes</span>
Answer:
I believe the answer you are looking for is 80.
Explanation: