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  2. AP Precalculus - Wikipedia

    en.wikipedia.org/wiki/AP_Precalculus

    Advanced Placement (AP) Precalculus (also known as AP Precalc) is an Advanced Placement precalculus course and examination, offered by the College Board, in development since 2021 [1] and announced in May 2022. [2]

  3. Amino acid - Wikipedia

    en.wikipedia.org/wiki/Amino_acid

    The 21 proteinogenic α-amino acids found in eukaryotes, grouped according to their side chains' pK a values and charges carried at physiological pH (7.4) 2-, alpha-, or α-amino acids [21] have the generic formula H 2 NCHRCOOH in most cases, [b] where R is an organic substituent known as a "side chain". [22]

  4. Coordination complex - Wikipedia

    en.wikipedia.org/wiki/Coordination_complex

    Cisplatin, PtCl 2 (NH 3) 2, is a coordination complex of platinum(II) with two chloride and two ammonia ligands.It is one of the most successful anticancer drugs. A coordination complex is a chemical compound consisting of a central atom or ion, which is usually metallic and is called the coordination centre, and a surrounding array of bound molecules or ions, that are in turn known as ligands ...

  5. AP Computer Science A - Wikipedia

    en.wikipedia.org/wiki/AP_Computer_Science_A

    Advanced Placement (AP) Computer Science A (also known as AP CompSci, AP CompSci A, APCSA, AP Computer Science Applications, or AP Java) is an AP Computer Science course and examination offered by the College Board to high school students as an opportunity to earn college credit for a college-level computer science course.

  6. Reactions to the 1989 Tiananmen Square protests and massacre

    en.wikipedia.org/wiki/Reactions_to_the_1989...

    Yan Xiaoqiao, a PhD chemistry student enrolled in Simon Fraser University, said "today is one of the darkest days in Chinese history". [74] Many of the Chinese foreign exchange students studying in Canada opted to apply for permanent residency in the aftermath of 4 June rather than return to China. [81]