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21 hours ago · Ptolemy's theorem states that the sum of the products of the lengths of opposite sides is equal to the product of the lengths of the diagonals. When those side-lengths are expressed in terms of the sin and cos values shown in the figure above, this yields the angle sum trigonometric identity for sine: sin(α + β) = sin α cos β + cos α sin β.
- Trigonometric Functions
Basis of trigonometry: if two right triangles have equal...
- Law of Cosines
Use in solving triangles Fig. 3 – Applications of the law of...
- Chebyshev Polynomial
and U n (x) are orthogonal with respect to another,...
- Trigonometric Functions
21 hours ago · Silicon is a chemical element; it has symbol Si and atomic number 14. It is a hard, brittle crystalline solid with a blue-grey metallic luster, and is a tetravalent metalloid and semiconductor. It is a member of group 14 in the periodic table: carbon is above it; and germanium, tin, lead, and flerovium are below it. It is relatively unreactive.
21 hours ago · Sundial. SSW facing, vertical declining sundial on the Moot Hall in Aldeburgh, Suffolk, England. The gnomon is a rod that is very narrow, so it functions as the style. The Latin motto loosely translates as "I only count the sunny hours." A horizontal dial commissioned in 1862, the gnomon is the triangular blade.
