#math
The values of trigonometric functions for 30°, 45°, and 60° can be derived from equilateral and right-angled triangles.
Deriving values for other angles can be more complex; however, the "Golden Triangle" can be used to determine the trigonometric values for 36° and 72°. In this triangle, the ratio of one of the equal sides to the base is phi (φ)—the golden ratio, (1 + √5)/2—and its angles are 36°, 72°, and 72°.
#math problem 01-10-2026
Calculus: Infinite nested square roots integral.🐍🪝
Compute the integral.
#math
The fundamental constant "e" was found hidden in the Pascal Triangle;its constructed by taking products instead of sums - of all elements in a row.
The discovery was made by H. J. Brothers in 2012.
(Pascal's triangle: The hidden stor-e, The Mathematical Gazette, March 2012)
#physics
For Aristotle, time is a riddle , something that divides the past, the present, and the future. But the present is merely the boundary between the past and the future; yet the past is something that no longer exists, and the future is something that does not yet exist. Thus, time appears to be a "nothingness" that separates something non-existent from something else that is also non-existent.
#math problem 30-09-2026
Calculus: Limit problem⏲️⏱️
Compute the limit.
#math problem 30-09-2026
Geometry problem🎈
If the "spherical cap" in Fig. 2 corresponds to 40% of the hemisphere's volume, then if a "cut" is made through the hemisphere along the X-Z plane (Fig. 1), will the "gray circular segment" represent 40% of the semicircle's area?