The task is to prove the trigonometric identity that tan(x1+x2) = (tan(x1) + tan(x2)) / (1 - tan(x1)tan(x2)). This involves using the sum of angles formula for tangent and manipulating the expression to show that the left-hand side is equal to the right-hand side. By simplifying both sides of the equation and showing that they are equal, we can confirm that the identity is correct. **

To get a TAN for instant transfer with the Push-TAN app, you first need to download the app from your bank's website or app store. Once installed, you will need to register for the service and link it to your bank account. When making a transfer, the app will send a notification to your device with a TAN that you can use to authorize the transaction instantly. Make sure to follow the setup instructions provided by your bank to ensure a smooth process. **

To prove that tan(x1+x2) = (tan(x1) + tan(x2)) / (1 - tan(x1)tan(x2)) is correct, one would need to use trigonometric identities such as the sum-to-product formula and the tangent addition formula. By manipulating the expressions using these identities, one can show that both sides of the equation are equivalent. It is important to carefully follow the steps of the proof and ensure that each manipulation is mathematically sound in order to confirm the correctness of the statement. **

To show that the equation tan(x1+x2) = (tan(x1) + tan(x2)) / (1 - tan(x1)tan(x2)) is correct, we can start by using the sum formula for tangent, which states that tan(x1+x2) = (tan(x1) + tan(x2)) / (1 - tan(x1)tan(x2)). We can then substitute the values of tan(x1) and tan(x2) into the equation and simplify both sides to see if they are equal. Finally, we can verify the result by checking if both sides of the equation are equal for different values of x1 and x2. **

Online payments can be secure if proper security measures are in place. This includes using secure websites with encryption, using trusted payment processors, and being cautious with sharing personal and financial information. It's important to look for the "https" in the website URL and a lock symbol in the address bar to ensure the website is secure. Additionally, using strong and unique passwords for online accounts can also help enhance security. **

The choice between online banking with push TAN, SMS TAN, or HBCI chip card depends on individual preferences and security concerns. Push TAN is considered more secure as it sends a unique transaction number directly to the user's mobile device, reducing the risk of interception. SMS TAN is also widely used but has a higher risk of interception. HBCI chip card is the most secure option as it requires a physical card and a card reader, but it is less convenient for everyday use. Ultimately, users should consider their own security needs and convenience when choosing a method for online banking. **

Yes, it is possible to distinguish a natural tan from a tanning bed tan. A natural tan tends to be more gradual and even, often developing over time with exposure to the sun. On the other hand, a tanning bed tan can appear more sudden and may have a more uniform color due to the concentrated UV exposure. Additionally, tanning bed tans may have a slightly different tone or hue compared to a natural tan. **

To receive a TAN (Transaction Authentication Number) for online banking, you typically need to register for online banking with your bank. Once registered, you can request a TAN through the bank's online banking platform or mobile app. The bank may send the TAN to you via SMS, email, or through a dedicated TAN generator device. It's important to keep your TAN secure and not share it with anyone to protect your online banking transactions. **