Use a round piece of paper to make an angle of 45 degrees and 135 degrees

Use a round piece of paper to make an angle of 45 degrees and 135 degrees

Fold the paper in half, then fold it in half, then fold it in half, that is 45 degrees; when only one fold is left, fold one side to the line of the second fold to form an angle of 90 + 45 degrees, that is 135 degrees
Can the fourth power of 5x - the square of 5x be calculated
5^4-5x^2
It's not an equation, so it can't be calculated
I want to know what the trigonometric function of acute angle is
Sin a 30 degrees 45 degrees 60 degrees
cos a
tan a
ctan a
Sina30 = 1 / 2, sin45 = (radical 2) / 2, sin60 = (radical 3) / 2
Cos30 = (radical 3) / 2, cos45 = (radical 2) / 2, cos60 = 1 / 2
Tan30 = (radical 3) / 3, tan45 = 1, tan60 = radical 3
Ctan30 = root 3, ctan45 = 1, ctan60 = (root 3) / 3
Cos a 60 45 30
Tan a radical (3) / 3 1 radical 3
Cot a radical 3 1 radical (3) / 3
Not ctan, right?
How to calculate the fourth power of X-Y
x^4-y^4
=(x^2-y^2)(x^2+y^2)
=(x-y)(x+y)(x^2+y^2)
An acute angle trigonometric function problem, using geometric language to express the calculation process, namely ∵
In RT △ ABC, ∠ C = 90 °,
(1) AC = 6, ∠ a = 60 °, finding unknown angle and edge
(2) AB = 10, Sina = 3 / 5, what is the length of BC
In RT △ ABC, the following formula is used to find BC / Sina = 6 / SINB, BC / sin60 = 6 / sin30, BC = 6sin60 / sin30 = 6 √ 3, ab = 6sin90 / sin30 = 12 (2) a
Calculate the - 3 power of 99 × the 3 power of 99, the 3 power of Y and the 4 power of Y
The negative power of 1 and Y
Are acute trigonometric functions only used in right triangles
No, acute trigonometric function is a part of trigonometric function, but we usually convert some trigonometric functions into acute trigonometric functions for convenience, so as to find out the function value
The sine, cosine and tangent of the acute angle a, the cotangent and the secant cosecant are all called the acute trigonometric function of angle A.
Sine (SIN) is equal to the opposite side than the hypotenuse;
Cosine (COS) is equal to the ratio of the adjacent edge to the hypotenuse;
Tangent (tan) is equal to the opposite side than the adjacent side;
Cotangent (COT) is equal to the ratio of adjacent edge to edge;
Secant (SEC) is equal to the ratio of hypotenuse to adjacent edge;
Cosecant (CSC) is equal to the ratio of hypotenuse to hypotenuse.
yes. Only in right triangles, my point. ... unfold
The sine, cosine and tangent of the acute angle a, the cotangent and the secant cosecant are all called the acute trigonometric function of angle A.
Sine (SIN) is equal to the opposite side than the hypotenuse;
Cosine (COS) is equal to the ratio of the adjacent edge to the hypotenuse;
Tangent (tan) is equal to the opposite side than the adjacent side;
Cotangent (COT) is equal to the ratio of adjacent edge to edge;
Secant (SEC) is equal to the ratio of hypotenuse to adjacent edge;
Cosecant (CSC) is equal to the ratio of hypotenuse to hypotenuse.
yes. Only in right triangles, my point. Put it away
No, ordinary trigonometric function is OK. Are you a high school student? If so, you can take a look at the first one of compulsory four of people's education press.
What is the - 5th power of (- y) and the 4th power of (- y)?
=-(1 / y to the fifth power · y to the fourth power)
=-1/y
(-y)^(-5)÷y^4=-y^(-5-4)
=-y^(-9)
(- y) negative fifth power divided by (- y) fourth power
The ninth power of minus 1 / Y
Is the acute trigonometric function only applicable to right triangles
It is obvious that trigonometric function alone does not hold for non right triangle
Sine and cosine theorem is the relation between trigonometric function of internal angle and edge, which holds for any triangle
Calculation: the fourth power of [(X-Y) / a] and the fifth power of (- A / X-Y)=________ .
Calculation: 2x + 1 / x + 1 × 1-x square / 1-4x square × 1 / X-1=_______ .
(1) [(x-y)/a]^4*(-a/(x-y)^5=a/y-x
(2)(2x+1)/(x+1)*(1-x^2)/(1-4x^2)*1/(x-1)=(2x+1)(1-x)(1+x)/(x+1)(1+2x)(1-2x)(x-1)=1/(2x-1)