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2. Small-angle approximation - Wikipedia

   en.wikipedia.org/wiki/Small-angle_approximation

   These approximations have a wide range of uses in branches of physics and engineering, including mechanics, electromagnetism, optics, cartography, astronomy, and computer science. [ 1 ] [ 2 ] One reason for this is that they can greatly simplify differential equations that do not need to be answered with absolute precision.

3. Variable speed of light - Wikipedia

   en.wikipedia.org/wiki/Variable_speed_of_light

   Attempts to incorporate a variable speed of light into physics were made by Robert Dicke in 1957, and by several researchers starting from the late 1980s. VSL should not be confused with faster than light theories, its dependence on a medium 's refractive index or its measurement in a remote observer's frame of reference in a gravitational ...

4. Dianna Cowern - Wikipedia

   en.wikipedia.org/wiki/Dianna_Cowern

   Dianna Leilani Cowern (born May 4, 1989) is an American science communicator.She is a YouTuber; she uploads videos to her YouTube channel Physics Girl explaining various physical phenomena.

5. Walmart exec warns customers Trump’s tariffs could mean ...

   www.aol.com/finance/walmart-exec-warns-customers...

   A Walmart spokesperson told Fortune that any price changes are speculative at this point, but future tariff-induced cost increases would be an additional burden to already price-sensitive shoppers.

6. 10 Items at Walmart That Cost Way More at Target - AOL

   www.aol.com/10-items-walmart-cost-way-120009414.html

   LG 65″ Class 4K UHD Smart OLED TV. Price at Target: $1,899.99 Price at Walmart: $1,596.99 If you’re looking to upgrade your TV, this 65″ smart TV from LG will cost you almost $400 less at ...

7. Walmart heads into official start of holiday season with ...

   www.aol.com/walmarts-promise-low-prices-prove...

   Walmart is heading into the official start of the holiday shopping season with strong tailwinds after ratcheting up better-than-expected fiscal third-quarter sales in many items including toys ...

8. List of optics equations - Wikipedia

   en.wikipedia.org/wiki/List_of_optics_equations

   Physics for Scientists and Engineers: With Modern Physics (6th ed.). W.H. Freeman and Co. ISBN ...

9. Trigonometric functions - Wikipedia

   en.wikipedia.org/wiki/Trigonometric_functions

   The other four trigonometric functions (tan, cot, sec, csc) can be defined as quotients and reciprocals of sin and cos, except where zero occurs in the denominator. It can be proved, for real arguments, that these definitions coincide with elementary geometric definitions if the argument is regarded as an angle in radians. [ 5 ]