What's 90 degrees

What's 90 degrees

sin90°=1
This is easy to understand in geometric sense
17-x = 8.5
17-x=8.5
x=17-8.5
x=8.5
How much is sin0? How much is sin30? How much is sin90
0 1/2 1
Solution equation: solution equation: 5 + 3x = 17.6-x
5+3x=17.6-x
3x+x=17.6-5
4x=12.6
x=12.6/4
x=3.15
The method of solving the equation is as follows
1. De denominator;
2. Remove brackets:
3. Transfer: 3x + x = 17.6-5
4. Merge similar items: 4x = 12.6
5. The coefficient is 1: x = 3.15
5+3x=17.6-x
4x=17.6-5
4x=12.6
x=3.15
5+3x=17.6-x
4x=12.6
x=3.15
The solution equation is: 5 + 3x = 17.6-x
4x = 12.6
x = 3.15
Wuliangshou Buddha, the Buddha said that the sea of bitterness is endless, looking back is the shore!
Benefactor, I see your bones are strange,
He is a man of noble bearing and wisdom,
There is no wonder in the world
If you devote yourself to study, you will become a great tool in the future,
I have a little test, please click next to the answer
"Choose as a satisfactory answer"... Expand
The solution equation is: 5 + 3x = 17.6-x
4x = 12.6
x = 3.15
Wuliangshou Buddha, the Buddha said that the sea of bitterness is endless, looking back is the shore!
Benefactor, I see your bones are strange,
He is a man of noble bearing and wisdom,
There is no wonder in the world
If you devote yourself to study, you will become a great tool in the future,
I have a little test, please click next to the answer
"Choose as a satisfactory answer" put away
5+3x=17.6-x
3x+x=17.6-5
4x=12.6
x=3.15
Is sin30 ° and sin45 ° equal to sin75 ° and why?
Is cos45-cos15 equal to cos30? Why?
Is sin60 equal to 2sin30? Why?
Obviously not equal to! Need to use and difference publicity
Sine and cosine formulas of sum of angles:
（1）sin（α+β）=sinαcosβ+cosαsinβ；
（2）cos（α+β）=cosαcosβ-sinαsinβ；
For example, 75 degrees can be divided into 30 + 45, which is obviously not equal
How could it be equal to? Not equal to
17-120% x = 5,
17—120%x=5
17-5=1.2x
x=10
A:
17—120%x=5
17-1.2x=5
transposition:
-1.2x=5-17
-1.2x=-12
1.2x=12
x=12/1.2
x=10
tan70=?sin70 cos70
tan(70)
=2.7474774195
sin(70)
=0.9396926208
cos(70)
=0.3420201433
8.5: x = 17:19
8.5:x=17:19
17x=19*8.5=161.5
x=161.5/17=9.5
(17/2):x = 17:19
=>17:2x=34:38
=>x=19/2
17x = 19 times 8.5. Just remove X
Let's make it a fraction, and then 17 is twice 8.5. So what's twice 19? Of course, 19 divided by 2, so x = 9.5
Cross difference multiplication 8.5 * 19 = 17x x = 9.5
8.5:x=17:19
17x=19*8.5
17x=161.5
x=9.5
Simplified evaluation (2sin80 '- cos70') / cos20`
(2sin80-cos70)/cos20
=[2sin(60+20)-sin20]/cos20
=[2(sin60cos20+cos60sin20)-sin20]/cos20
=(2sin60cos20+2cos60sin20-sin20)/cos20
Because cos60 = 1 / 2
Therefore, the original formula = (2sin60cos20 + 2 × 1 / 2sin20-sin20) / cos20
=(2sin60cos20+sin20-sin20)/cos20
=(2sin60cos20)/cos20
=2sin60
=2×√3/2
=√ 3 [denotes root 3]
Solving the equation of (x-69570) / X / 0.17 = 2.5%
{X-69570}/X/0.17=2.5%
{X-69570}/X=0.00425
X-69570=0.00425X
0.99575X=69570
X=69886.934472