How to express 18.15 ° in degrees, minutes and seconds

How to express 18.15 ° in degrees, minutes and seconds

18.15°=18°9’
That is, 0.15 ° = 0.15 × 60 = 9 '
It should be 18 ° 9'0 "(18 degrees 9 minutes 0 seconds)
F (x) = (AX + b) SiNx + (Cx + D) cosx try to determine the constants a, B, C, d such that f '(x) = xcos
F '(x) is the derivative of function f (x)
f'(x)=asinx+(ax+b)cosx+c*cosx-(cx+d)sinx
=(a+d)sinx-cxsinx+axcosx+(b+c)cosx
Identical to xcosx
>
a+d=0,c=0,a=1,b+c=0
A=1
B=0
C=0
d=-1
63.5 ° is expressed in degrees, minutes and seconds, and 18 ° 18'18 ° is expressed in degrees
63.5°=63°30'
18°18′18°=18.305°
Let f (x) = (AX + b) SiNx + (Cx + D) cosx, try to determine the constants a, B, C, D, such that f '(x) = xcosx
From the known f ′ (x) = [(AX + b) SiNx + (Cx + D) cosx] ′ = [(AX + b) SiNx] ′ + [(Cx + D) cosx] ′ = (AX + b) ′ SiNx + (AX + b) (SiNx) ′ + (Cx + D) ′ cosx + (Cx + D) · (cosx) ′ = asinx + (AX + b) cosx + ccosx - (Cx + D) SiNx = (a-cx-d) sin
Please change 51 degrees, 18 minutes and 42 seconds into degrees
51°18’42’’=51.3117°
Let y = xcosx, find y '(1) y' = x'cosx + X (cosx) 'and change the derivative of (cosx)' to - SiNx
Of course, the request came out
So y '= cosx xsinx
y=xcosx
y'=x'*cosx+x*sin'x
=1*cosx+x*(-sinx)
=cosx-xsinx
(1) 58 ° 28 ′ 12 ″, (2) 36 ° 17 ′ 42 ″, (3) 216 ° 42 ″
(1) 58 ° 28'12 "expressed in degrees = 58.47 degrees
(2)36°17′42″=36.295°
(3)216°42′=216.7°
Note: the key to this kind of problem is: the degree remains unchanged, the whole minute and second is changed into seconds, and then the degree is changed
58°28′12″=58°+28x60''+12''=58°+1692''
1692 ″ 3600 = 0.47, so the conversion degree is 58.47 degrees
Lei She
They are 58 57 / 120 degrees, 36 177 / 600 degrees and 216.7 degrees respectively
If f (x) = SiNx + A ^ 3, where a is a constant, then f '' (x) = () a.cosx + 3A ^ 2 b.sinx + 6A C. - SiNx d.cosx
The derivative of the constant is 0, so f '(x) = cosx, f' (x) = - SiNx
Choose C
The answer is D, a is a constant, then the third power of a is a constant, and the derivative of the constant is 0, so it's cosx.
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42.34 ° in degrees, minutes and seconds
0.34 degree = 0.34 × 60 = 20.4 points
0.4 min = 0.4 × 60 = 24 s
So 42.34 degrees = 42 degrees 20 minutes 24 seconds
To find the definite integral of (SiNx xcosx) / (cosx xsinx) from 0 to 1, please;
Ah. You students really occupy the whole Baidu know. Asked nearly 20 times. Last 3 days
But you can give up this topic. Elementary function can't express original function