Advertisements
Advertisements
प्रश्न
`tan^-1 ((sqrt(1 + x^2) + sqrt(1 - x^2))/(sqrt(1 + x^2) - sqrt(1 - x^2))), -1 < x < 1, x ≠ 0`
Advertisements
उत्तर
Let y = `tan^-1 ((sqrt(1 + x^2) + sqrt(1 - x^2))/(sqrt(1 + x^2) - sqrt(1 - x^2)))`
Putting x2 = cos 2θ
∴ θ = `1/2 cos^-1 x^2`
y = `tan^-1 ((sqrt(1 + cos 2theta) + sqrt(1 - cos 2theta))/(sqrt(1 + cos 2theta) - sqrt(1 - cos 2theta)))`
⇒ y = `tan^-1 ((sqrt(2cos^2theta) + sqrt(2sin^2theta))/(sqrt(2cos^2theta) - sqrt(2sin^2theta)))`
⇒ y = `tan ((sqrt(2) cos theta + sqrt(2) sin theta)/(sqrt(2) cos theta - sqrt(2) sin theta))`
⇒ y = `tan^-1 ((cos theta + sin theta)/(cos theta - sin theta))`
⇒ y = `tan^-1 [((costheta)/(costheta) + (sintheta)/(costheta))/((costheta)/(costheta) - (sintheta)/(costheta))]`
⇒ y = `tan^-1 [(1 + tan theta)/(1 - tan theta)]`
⇒ y = `tan^-1 [(tan pi/4 + tan theta)/(1 - tan pi/4 * tan theta)]`
⇒ y = `tan^-1 [tan (pi/4 + theta)]`
⇒ y = `pi/4 + theta`
⇒ y = `pi/4 + 1/2 cos^-1 x^2`
Differentiating both sides w.r.t. x
`"dy"/"dx" = "d"/"dx" (pi/4) + 1/2 "d"/"dx" (cos^-1 x^2)`
= `0 + 1/2 xx (-1)/sqrt(1 - x^4) * "d"/"dx" (x^2)`
= `(-1.2x)/(2sqrt(1 - x^4)`
= `- x/sqrt(1 - 4x^4)`
Hence, `"dy"/"dx" = - x/sqrt(1 - x^4)`.
APPEARS IN
संबंधित प्रश्न
Differentiate the function with respect to x.
`2sqrt(cot(x^2))`
Prove that the function f given by f(x) = |x − 1|, x ∈ R is not differentiable at x = 1.
Differentiate the function with respect to x:
sin3 x + cos6 x
Differentiate the function with respect to x:
`sin^(–1)(xsqrtx), 0 ≤ x ≤ 1`
If (x – a)2 + (y – b)2 = c2, for some c > 0, prove that `[1+ (dy/dx)^2]^(3/2)/((d^2y)/dx^2)` is a constant independent of a and b.
Does there exist a function which is continuos everywhere but not differentiable at exactly two points? Justify your answer?
If y = tan(x + y), find `("d"y)/("d"x)`
Differentiate `tan^-1 (sqrt(1 - x^2)/x)` with respect to`cos^-1(2xsqrt(1 - x^2))`, where `x ∈ (1/sqrt(2), 1)`
| COLUMN-I | COLUMN-II |
| (A) If a function f(x) = `{((sin3x)/x, "if" x = 0),("k"/2",", "if" x = 0):}` is continuous at x = 0, then k is equal to |
(a) |x| |
| (B) Every continuous function is differentiable | (b) True |
| (C) An example of a function which is continuous everywhere but not differentiable at exactly one point |
(c) 6 |
| (D) The identity function i.e. f (x) = x ∀ ∈x R is a continuous function |
(d) False |
cos |x| is differentiable everywhere.
sinx2 + sin2x + sin2(x2)
`sin^-1 1/sqrt(x + 1)`
sinmx . cosnx
`tan^-1 (secx + tanx), - pi/2 < x < pi/2`
`tan^-1 (("a"cosx - "b"sinx)/("b"cosx - "a"sinx)), - pi/2 < x < pi/2` and `"a"/"b" tan x > -1`
`sec^-1 (1/(4x^3 - 3x)), 0 < x < 1/sqrt(2)`
If xm . yn = (x + y)m+n, prove that `("d"^2"y")/("dx"^2)` = 0
If y = `sqrt(sinx + y)`, then `"dy"/"dx"` is equal to ______.
If k be an integer, then `lim_("x" -> "k") ("x" - ["x"])` ____________.
A function is said to be continuous for x ∈ R, if ____________.
If `y = (x + sqrt(1 + x^2))^n`, then `(1 + x^2) (d^2y)/(dx^2) + x (dy)/(dx)` is
If sin y = x sin (a + y), then value of dy/dx is
If `ysqrt(1 - x^2) + xsqrt(1 - y^2)` = 1, then prove that `(dy)/(dx) = - sqrt((1 - y^2)/(1 - x^2))`
A particle is moving on a line, where its position S in meters is a function of time t in seconds given by S = t3 + at2 + bt + c where a, b, c are constant. It is known that at t = 1 seconds, the position of the particle is given by S = 7 m. Velocity is 7 m/s and acceleration is 12 m/s2. The values of a, b, c are ______.
Let S = {t ∈ R : f(x) = |x – π| (e|x| – 1)sin |x| is not differentiable at t}. Then the set S is equal to ______.
If f(x) = `{{:(ax + b; 0 < x ≤ 1),(2x^2 - x; 1 < x < 2):}` is a differentiable function in (0, 2), then find the values of a and b.
If f(x) = `{{:(x^2"," if x ≥ 1),(x"," if x < 1):}`, then show that f is not differentiable at x = 1.
Which expression defines the derivative of a real function \[f\] at a point \[c\] in its domain?
If \[u\] and \[v\] are differentiable functions, what is \[(uv)'\]?
What is \[\frac{d}{dx}(\sin x)\]?
What is \[\frac{d}{dx}(\tan x)\]?
When is a function differentiable on an open interval \[(a,b)\]?
For differentiability on a closed interval \[[a,b]\], which derivative is considered at \[a\]?
For differentiability on a closed interval \[[a,b]\], which derivative is considered at \[b\]?
If a function \[f\] is differentiable at a point \[c\], what must be true at that point?
If \[f\] is differentiable at \[c\], which limit equals \[f'(c)\]?
