How many hours does it take for 0.12 kwh to reach 1 kwh

How many hours does it take for 0.12 kwh to reach 1 kwh

8 hours 20 minutes
The known function f (x) = 2sinxcosx-2cos & # 178; X-1
(1) Find the maximum value of F (x) and the corresponding value of X
(2) If f (β) = 3 / 5, find Cos2 (π / 4 - 2 β)
Tips:
f（x）=2sinxcosx-2cos²x-1
=2sinxcosx-(2cos²x-1)-2
=sin2x-cos2x-2
=√2(sin2xcosπ/4-cos2xsinπ/4)-2
=√2sin(2x-π/4)-2
When 2x - π / 4 = π / 2, i.e. x = Time
F (x) max: √ 2-2
48 yuan per kilowatt hour in Beijing. How much kilowatt hour is 20 yuan?
What's the formula
You can divide 20 by 0.48
20/0.48=41.66
Given the function f (x) = 2sinxcosx + 2cos & # 178; X (x ∈ R). (1) find the minimum positive period of F (x) and the minimum value of F (x)
(1) ∵ f (x) = 2sinxcosx + 2cos & # 178; X = 2sinxcosx + (2cos & # 178; x-1) + 1 = sin (2x) + cos (2x) + 1 = (√ 2) sin (2x + π / 4) + 1 ∵ t = 2 π / 2 = π. Let 2x + π / 4 = 3 π / 2 + 2K π, then x = 5 π / 8 + K π (K ∈ z). That is, when x = 5 π / 8 + K π (K ∈ z), f (x) has a minimum value of 1 - √ 2. (2) ∵ f (?)
178 kwh per kilowatt hour. How many tons can be produced at 45000 kwh?
1/0.178=4.5/x
X = 4.5 * 0.178 = 0.801 (10000 tons)
See the following known function y = 1 / 2cos & # 178; X + √ 3 / 2sinxcosx + 1, X ∈ R
Given the function y = 1 / 2cos & # 178; X + √ 3 / 2sinxcosx + 1, X ∈ R, ① amplitude, period and initial phase, ② draw a diagram of the function within a period by 5-point method, ③ what kind of translation and expansion transformation is the image of the function y = SiNx (x ∈ R)?
Y = 1 / 2cos & # 178; X + √ 3 / 2sinxcosx + 1 = (1 + cos2x) / 4 + 1 + √ 3 / 4sin2x = 1 / 2 * sin (2x + 30 °) + 4 / 5, you should be able to ask for others
What's 475 degrees
two hundred and thirty-seven point five
A: 2375 Jiao
Given the vector M = (Sina, COSA), n = (1, - 2) and m ⊥ n. (1) find the value of Tana; (2) find the range of function f (x) = cos2x + tanasinx (x ∈ R)
(1) ∵ m · n = sina-2cosa = 0 ∵ Tana = 2 (2) f (x) = cos2x + 2sinx = 1-2sin2x + 2sinx = − 2 (SiNx − 12) 2 + 32 ∵ - 1 ≤ SiNx ≤ 1 ∵ when SiNx = 12, f (x) has the maximum value of 32; when SiNx = - 1, f (x) has the minimum value of - 3. So the range of F (x) is [− 3, 32]
(1) You know
(2) F (x) = cos2x + tanasinx = 1-2sin & # 178; X + 2sinx, let SiNx = t, - 1sina / cosa = 2 = > Tana = 2
f(x)=cos2x+tanA=>f(x)=cos2x+2
What is the power per kilowatt hour?
Degree is the unit of energy, W is the unit of power. One degree of electricity is equivalent to 1000 W of electrical appliances. In one hour, it is 1 kW. H
The decreasing interval of function f (x) = cosx SiNx is?
f(x)=cosx-sinx
=√2(√2/2cosx-√2/2sinx)
=√2cos(π/4+x)
The decreasing interval is [- π / 4 + 2K π, 3 π / 4 + 2K π]
f(x)=cosx-sinx
=Radical 2 (cos45cosx-sin45sinx)
=Root 2cos (45 + x)
0≤π/4+x≤2kπ
-π/4≤x≤2kπ+π/4
[- π / 4,2k π + π / 4] (k belongs to Z)
Hope to adopt, thank you_ ∩)o