The expression that is not a variation of the Pythagorean identity is the third option.
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What is the Pythagorean identity?</h3>
The Pythagorean identity can be written as:

For example, if we subtract cos^2(x) on both sides we get the second option:

Which is a variation.
Now, let's divide both sides by cos^2(x).

Notice that the third expression in the options looks like this one, but the one on the right side is positive. The above expression is in did a variation of the Pythagorean identity, then the one written in the options (with the 1 instead of the -1) is incorrect, meaning that it is not a variation of the Pythagorean identity.
Concluding, the correct option is the third one.
If you want to learn more about the Pythagorean identity, you can read:
brainly.com/question/24287773
Answer:
D
Step-by-step explanation:
The formula for volume of cone is 
Where
V is the volume
r is the radius of the circular base
h is the height of the cone
<em>In the diagram shown, we can clearly see that height is 12, radius is 9. We can simply plug them into the formula and get our exact answer (leaving pi as pi):</em>
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<em>correct answer is D</em>
Answer:
It is the number written out to show each digit
Step-by-step explanation:
Let's say you have the number 459
you write out the hundredths place, which is 4 times 100
you write out the tenths place which is 5 times 10
and you write out the oneths place which is 9 times 1
the full thing written out is 459 = 100×4 + 5×10 + 9 × 1
-3/7 is greater than -2/5
how I found this do 3÷7 and this will give you a decimal of 0.4285. While doing 2÷7 equals 0.4
hope this helps
Answer:
ur mom doiiii
Step-by-step explanation: