title: VBA sin() and cos() trouble
body: <p>Im trying to make some VBA form and to calculate some simple values but I dont understand why VBA dosen't recognize Sin() and Cos() functions. For example: I wrote int() and VBA transformed it into Int(), but it doesn't do the same with sin and cos. 
  Moreover, after I'm trying to compile my code</p>
  
  <pre><code>    Private Sub btn_exit_Click()
      Unload laborator_2
  End Sub
  
  Private Sub btn_start_Click()
      today.Caption = Date
      rnb_val.Caption = Int(Rnd * 90 + 1)
      sqrt_val.Caption = Sqr(rnb_val.Caption)
      si_val.Caption = sin(rnb_val.Caption * 3.14159 / 180)
      co_val.Caption = rnb_val.Caption * 3.1459 / 180
  End Sub
  </code></pre>
  
  <p>I got this message:</p>
  
  <pre><code>Run-time error "424" Object required
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/PeXvt.png" alt="enter image description here"></p>
  
  <p>Im new in VBA, so sorry if I didn't write all details. Thank you.</p>