Yes, the Tamron 70-200mm f/2.8 is suitable for both horse and portrait photography. The 70-200mm focal length allows for capturing subjects from a distance, making it ideal for photographing horses in action or from a distance without disturbing them. Additionally, the f/2.8 aperture provides excellent low-light performance and beautiful background blur, making it great for portrait photography. The lens also offers fast and accurate autofocus, further enhancing its suitability for capturing both horses and portraits. **

Yes, there are used Nikon F lenses available for landscape photography within a budget of up to 150 euros. You can find options like the Nikon 28mm f/2.8, Nikon 35mm f/2.8, or Nikon 50mm f/1.8 lenses that are suitable for capturing landscapes. These lenses may be older models, but they can still produce high-quality images for landscape photography at an affordable price point. It's important to research and ensure the lens is in good condition before making a purchase. **

Yes, there are used Nikon F lenses available for landscape photography within the price range of up to 150 euros. These lenses may include wide-angle options such as the Nikon 28mm f/2.8 or the Nikon 35mm f/2.8, which are popular choices for capturing landscapes. While they may not be the latest models, these lenses can still produce high-quality images and are a more budget-friendly option for photographers looking to explore landscape photography with Nikon F mount lenses. **

The function f(a) has no local extrema when its derivative f'(a) does not change sign in any neighborhood of a. This means that the function is either strictly increasing or strictly decreasing in the neighborhood of a, and therefore does not have a local maximum or minimum at that point. In other words, if f'(a) > 0 for all a in a neighborhood, then f(a) is strictly increasing and has no local maximum, and if f'(a) < 0 for all a in a neighborhood, then f(a) is strictly decreasing and has no local minimum. **

If f(x) = 0 and f'(x) = 0, it means that the function has a critical point at x where the function value and its derivative are both zero. A point of inflection occurs when the concavity of the function changes, which is indicated by the second derivative changing sign. Since the second derivative is not given in this scenario, we cannot determine if there is a point of inflection. **

For landscape photography, a camera with a high resolution sensor and wide dynamic range is ideal to capture the details and colors of the scenery. A full-frame DSLR or mirrorless camera with a wide-angle lens would be a good choice for capturing the vastness of landscapes. For street photography, a compact and discreet camera with fast autofocus and good low-light performance is preferred. A mirrorless camera with a prime lens or a high-quality compact camera would be suitable for capturing candid moments and street scenes without drawing too much attention. **

The function f(x) = x^1 has no root because any non-zero number raised to the power of 1 will always result in a non-zero value. In other words, the function will never equal zero for any value of x. Therefore, there is no value of x that can be considered a root of the function. **

Not F. **