Help with math.sin and math.cos

Help and Feedback Scripting Support
#1

Hello, I have been working on an FPS framework but I am having some problems with my walking animation, here is what I mean:


Here is my script:

local plr = game.Players.LocalPlayer
local character = plr.Character or plr.CharacterAdded:Wait()
local humanoid = character:WaitForChild('Humanoid')
local rs = game:GetService('RunService')
local cam = workspace.Camera
local viewModel = game.ReplicatedStorage.Pistol:Clone()
viewModel.Parent = cam
local cf = CFrame.new()
cf = CFrame.new(1.5,-1,1.5)

rs.RenderStepped:Connect(function()
	viewModel:SetPrimaryPartCFrame(cam.CFrame * cf)
	if humanoid.MoveDirection.Magnitude > 0 then
		local Y
		local X
		local Time = tick()
		if math.sin(Time*3)>=0 then
			Y = -math.sin(Time * 3)
		else
			Y = math.sin(Time * 3)
		end
		if math.cos(Time*4)>=0 then
			X = -math.cos(Time * 4)
		else
			X = math.cos(Time * 4)
		end
		cf = cf:Lerp(CFrame.new(1.5 + X,-1+Y,1.5),0.1)
	else
		cf = cf:Lerp(CFrame.new(1.5,-1,1.5),0.1)
	end
end)

How can I fix this?
Thank you!

#2

I tried using math.sin for both of the axis but it looks weirder.