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Q: Why does -1 squared equal -2?

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No because no 2 numbers can be squared to equal 4. 1 squared is 1 2 squared is 4 so the lowest answer is 5.

1 - sin2x(1+ cos2x)/2

None of the graphs that I can see!

(1 metre) squared = (1000 mm) squared = 1000000 mm squared.

No

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1 squared plus 8 squared or 4 squared plus 7 squared

1 squared radical 40 is equal to 1 squared radical (4 x 10), and this become 2 squared radical 10. By adding 2 squared radical10 with 3 squared radical 10 we get 5 squared radical 10.

Sin squared is equal to 1 - cos squared.

No because no 2 numbers can be squared to equal 4. 1 squared is 1 2 squared is 4 so the lowest answer is 5.

1 - sin2x(1+ cos2x)/2

sin2 x = (1/2)(1 - cos 2x) cos2 x = (1/2)(1 + cos 2x) Multiplying both you get (1/4) (1 - cos2 2x) Which is equal to (1/4) (1 - (1/2) (1 + cos 4x) = (1/8) (2 - 1 - cos 4x) = (1/8) (1 - cos 4x) Or If it is the trigonomic function, sin squared x and cosine squared x is equal to one

None of the graphs that I can see!

This question can not be solved

Cos^2 x = 1 - sin^2 x

2 x cosine squared x -1 which also equals cos (2x)

9a squared = 81a^2

2^2 + 3^2 = 4 + 9 = 13

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