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In Excel, the ACos function returns the arccosine (in radians) of a number.The syntax for the ACos function is:ACos( number )number is a number between -1 and 1. It is the cosine of the angle that you wish to find.Applies To:Excel 2007, Excel 2003, Excel XP, Excel 2000
acos
Check out the acos function.
Include the header file math.h and use the function acos(d)
include file math.h and you get most C++ functions for trigonometry, for instance,sin(), cos(), tan(), asin(), acos(), and atan() etc.
#include<iostream> int main() { std::cout << "sin(1) = " << std::sin(1.0) << std::endl; std::cout << "cos(1) = " << std::cos(1.0) << std::endl; std::cout << "tan(1) = " << std::tan(1.0) << std::endl; std::cout << "asin(1) = " << std::asin(1.0) << std::endl; std::cout << "acos(1) = " << std::acos(1.0) << std::endl; std::cout << "atan(1) = " << std::atan(1.0) << std::endl; } Output: sin(1) = 0.841471 cos(1) = 0.540302 tan(1) = 1.55741 asin(1) = 1.5708 acos(1) = 0 atan(1) = 0.785398
When tan A = 815, sin A = 0.9999992 and cos A = 0.0012270 so that sin A + cos A*cos A*(1-cos A) = 1.00000075, approx.
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Amplitude can be calculated from either of the following formulas x = asin(wt + ϕ) if the motion is along x-axis or y = acos(wt + ϕ) if the motion is along y-axis. Thus, amplitude is the the maximum extent of a vibration or oscillation, measured from the position of equilibrium.
The amplitude of a function is half the distance between the maximum and minimum values. This is the absolute value of the number in front of the trig function. for example, y=Asin(x) or y= Acos(x) the absolute value of A is the amplitude. Therefore, the amplitude of y=-2sinx is 2
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