It is known that tan2x = - 2 √ 2, π - 2

It is known that tan2x = - 2 √ 2, π - 2

(1) Tan2x = 2tanx / (1-tanx ^ 2) = - 2 √ 2, so TaNx = √ 2 or (- √ 2) / 2 because π

If we know Tan (a + Wu / 4) = 2, we can find sinacosa cos square a

Tan (a + π / 4) = 2 = (Tana + Tan π / 4) / (1-tanatan π / 4) = (1 + Tana) / (1-tana) Tana = 1 / 3 sinacosa cos ^ 2A = (sinacosa cos ^ 2a) / (sin ^ 2A + cos ^ 2a) (divide by cos ^ 2a) = (tana-1) / (1 + Tan ^ 2a) = - 1 / 5

Given: Tan (π / 4 + a) = 2, find 1 / (2sinacosa + cos ^ 2a)

tan(π/4+a)=(1+tana)/(1-tana)=2,
1+tana=2-2tana,
tana=1/3.
1/(2sinacosa+cos^2a)
=(sin^2a+cos^2a)/(2sinacosa+cos^2a)
=(tan^2a+1)/(2tana+1)
=(1/9+1)/(2/3+1)
=2/3.

What's wrong with the fact that the distance between the corresponding points of two axisymmetric figures of a straight line is equal

The distance between the two corresponding points and the straight line is equal

For two figures symmetrical to a line, () and () are exactly the same

Two figures symmetrical about a line, (shape) and (size) are exactly the same

Why is it wrong to say that two figures symmetrical about a certain line are called symmetry axis figures?
Why?

Axisymmetric figure refers to a figure in which there is a straight line so that one part of the figure can completely coincide with the other
The above two figures are symmetrical about a straight line, not the same concept

If two figures are symmetrical about a line, then they are congruent, right

If two figures are symmetrical about a line, they are congruent
correct
Because it's perfectly coincident

Two straight lines, two triangles, two circles, what can you make?
The most creative should be the cottage
Tell me how to use lines and triangles and circles
Also, please don't copy other people's answers. I see that some people's answers coincide with those of others a few years ago.

Bicycles are OK. The two circles are wheels
Two triangles form the frame of the front body and the frame of the rear body, which are the kind of cars with straight beams. One straight line is the handlebar, and the other is the axle under the front handlebar
Can also be a balance, a straight line is the middle of the pole, a support pole, triangle hanging circle do scale

What pattern can two triangles, two circles and two straight lines form?

Two lights
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○ 」
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A. the figure composed of two rays is called angle B. the figure composed of two line segments with a common endpoint is called angle C. an angle is a line
The following statement is correct ()
A. The pattern of two rays is called an angle
B. A graph consisting of two line segments with a common endpoint is called an angle
C. An angle is a figure in which a ray rotates around an end point
D. An acute angle is twice that of an obtuse angle

Choose C