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Anonymous users2024-02-08It's better to draw a coordinate, 0 360 degrees, and rotate it as you like.
Understand what sine, cosine, tangent, cotangent, mean, basic like sin0=0, sin90=1, cos0=1=sin90 cos90=0=sin0
The square of sina + the square of cosa = 1
Basically, it's fine. The north can be deduced.
It is recommended to read the book several times.
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Anonymous users2024-02-07<> induction formula.
Formula 1: Set.
For any angle, the value of the same trigonometric function for the same angle with the same end edge is equal:
Formula 2: Set burnout.
is an arbitrary angle, <>
And. <>
The relationship between the values of the trigonometric function:
Equation 3: Arbitrary angle.
And. <>
The relationship between the values of the trigonometric function:
Formula 4: <>
And. <>
The relationship between the trigonometric values of the leather shirt:
Formula 5: <>
And. <>
The relationship between the values of the trigonometric function:
Formula 6: <>
And. <>
And. <>
The relationship between the trigonometric values of the collapse and rise:
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Anonymous users2024-02-06sin@ = Opposite edge hypotenuse.
cos@ = adjacent edge hypotenuse.
tan@ = Opposite edge Adjacent edge.
cot@ = adjacent edge to edge.
1. SIN degree formula.
1、sin 30= 1/2
2. sin 45 = root number 2 2
3. sin 60 = root number 3 2
2. COS power formula.
1. cos 30 = root number 3 2
2. cos 45 = root number 2 2
3、cos 60=1/2
3. Tan degree formula.
1. tan 30 = root number 3 3
2、tan 45=1
3. tan 60 = root number 3
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Anonymous users2024-02-05Trigonometric functions were originally defined as the ratio of two sides in a right triangle.
sina=a/c
cosa=b/c
tana=a/b
cota=b/a
seca=c/b
csca=c/a
There is a relationship and connection between these functions. Knowing one of them will tell the values of the others.
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Anonymous users2024-02-041. Turn on the power of the student-specific calculator.
2. Click the shift key to calculate the symbol, and switch the sensitive hail trigonometric width function to the inverse trigonometric function calculation.
3. Click cos on the keyboard, and the cos will be displayed on the calculator display screen - after pressing the shift key, cosine cos can become anticosine arccos.
4. Input, i.e., calculate the value of cos (.
5. Press the equal sign =, and the calculation result of cos (30 will be displayed on the calculator screen, which means cos (
Trigonometric formulas include the sum sum formula, the sum difference product formula, the triple angle formula, the sine double angle formula, the cosine double angle formula, the cosine theorem, etc. >>>More
Using sina + sinb = 2 sin((a+b) 2)cos((a-b) 2
sin(7c)-sin(5c)=sin(7c)+sin(-5c)=sinc >>>More
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Memorize more, memorize more, and write more on paper.