It is ln[1+sqrt(2)] = 0.8814, approx.
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If you reflect a function across the line y=x, you will have a graph of the inverse. For trigonometric problems: y = sin(x) has the inverse x=sin(y) or y = sin-1(x)
The inverse of sine (sin) is cosecant (csc). The inverse of cosine (cos) is secant (sec). The inverse of tangent (tan) is cotangent (cot).
For example. d/dx sin^-1 X = 1/sqrt(1 - x^2) Probably derived from the Pythagorean theorem.
type the value of sine in the calculator and press 2ND SIN for sin-1, or press 2ND SIN for sin-1 and type the value of sine, because -sin(.xxxx) = angle known as inverse sine
In radians. sin(1.0003) = 0.8416330376 ===================