Answer:
x=πn, n∈Z
Step-by-step explanation:
if sin²2x=1-cos²2x, then
1-cos²2x-2cos2x+2=0; ⇒ cos²2x+2cos2x-3=0; ⇔ (cos2x+3)(cos2x-1)=0;
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1 answer:
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Answer:
294 in.²
Step-by-step explanation:
I believe this figure is a rectangular prism.
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<u>Explain:</u>
To find the surface area of a rectangular prism, use this formula:
or
A phrase I use to help remember this formula is:
LISA WILSON LOST HER WITCH HAT TWICE (2)
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<u>Solve:</u>
The length of this rectangular prism is 9 in.
This width is 10 in.
The height is 3 in.
Now, I will plug the numbers into the first formula.
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<u>Conclude:</u>
I, therefore, believe the area of this rectangular prism is 294 in.²
