Trigonometry, the branch of mathematics concerned with specific functions of angles. There are six functions commonly used in trigonometry: sine (sin), cosine (cos), tangent (tan), cotangent …

4 days ago · Constitution of the United States of America - Amendments, Ratification, Bill of Rights: A brief synopsis of the amendments to the U.S. Constitution, along with links to articles …

5 days ago · Jasmine Crockett is a Democratic congresswoman from Texas. She is an outspoken civil rights advocate, known for her forceful criticism of U.S. Pres. Donald Trump and her …

Nov 20, 2025 · Certain intrinsic qualities of the trigonometric functions make them useful in mathematical analysis. In particular, their derivatives form patterns that are useful for solving …

Nov 6, 2025 · Hipparchus’s most significant contribution to mathematics may have been to develop—if not actually invent—a trigonometry based on a table of the lengths of chords in a …

Oct 30, 2025 · Stephen Austin was the founder in the 1820s of the principal settlements of English-speaking people in Texas when that territory was still part of Mexico. Raised on the …

Nov 17, 2025 · Geometry and trigonometry: Pi is fundamental to formulas involving circles, spheres, and related figures. The circumference of a circle is given by 2πr and its area by πr …

Alamo, 18th-century Franciscan mission in San Antonio, Texas, U.S., that was the site of a historic resistance effort by a small group of determined fighters for Texan independence …

Dec 1, 2025 · Rio Grande, fifth longest river of North America, and the 20th longest in the world, forming the border between the U.S. state of Texas and Mexico. The total length of the river is …

2 days ago · The U.S. Department of Defense is an executive division of the U.S. federal government responsible for ensuring national security and supervising U.S. military forces. …