by hazem khalfallah (1 Submission)
Category: Math/Dates
Compatability: VB 6.0
Difficulty: Unknown Difficulty
Originally Published: Sun 28th April 2002
Date Added: Mon 8th February 2021
Rating: 
(1 Votes)
How to solve sin(x)
VBcoders
Dim x As Double
Dim n As Long
Dim xs As Double
Dim sign As Integer
sign = 1
x = Val(txtx.Text)
If x < 0 Then sign = -1
xs = x
n = Val(txtn.Text)
If n <= 0 Then
lbldisplay.Caption = "******No solution for zero terms."
Else
x = Abs(x)
Do While x > twopi
x = x - twopi
Loop
lbldisplay.Caption = "sin(" & x & ") = " & _
sign * xsine(x, n) _
& vbNewLine & "sin(" & xs & ")=" & Sin(xs)
End If
End Sub
Private Function xsine(x As Double, n As Long) As Double
Dim ans As Double
Dim e As Long
Dim sign As Integer
sign = 1
ans = x
For e = 3 To (2 * n) Step 2
sign = sign * (-1)
newterm = x ^ e / factorial(e) * sign
ans = ans + newterm
Next e
xsine = ans
End Function
Private Function factorial(e As Long) As Double
Dim p As Double
Dim k As Long
p = 1
For k = e To 1 Step -1
p = p * k
Next k
factorial = p
End Function
Private Sub cmdclear_Click()
txtx.Text = ""
txtn.Text = ""
lbldisplay.Caption = ""
End Sub
Private Sub cmdexit_Click()
End
End Sub
