There are several websites and apps that allow you to upload images of homework questions and get answers without requiring signup or email. Here are some options:
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PhotoMath - You can simply take a picture of math problems, and it provides step-by-step solutions. It's mainly focused on math, but it's quite powerful.
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Mathway - Similar to PhotoMath, you can upload images of math problems, and it will generate solutions.
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Cymath - Another math-solving app that allows for image input and gives detailed answers.
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Google Lens - If you have the Google app or the Google Photos app, you can use Google Lens to take a picture of the homework question, and it will often provide answers or help you find relevant resources.
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Chegg - While it does have some features that require a subscription, you can sometimes use their mobile app to scan and get instant answers without logging in.
While these tools are primarily focused on math and science queries, they can be helpful for various subjects. Keep in mind that while these tools can provide answers, it's important to understand the concepts behind the problems to enhance your learning.