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  2. Special right triangle - Wikipedia

    en.wikipedia.org/wiki/Special_right_triangle

    The 30°–60°–90° triangle is the only right triangle whose angles are in an arithmetic progression. The proof of this fact is simple and follows on from the fact that if α, α + δ, α + 2δ are the angles in the progression then the sum of the angles 3α + 3δ = 180°. After dividing by 3, the angle α + δ must be 60°. The right angle ...

  3. Warriner's English Grammar and Composition - Wikipedia

    en.wikipedia.org/wiki/Warriner's_English_Grammar...

    In 1942 or 1943, Warriner was approached by a publisher's sales representative about revising a grammar book dating from 1898. Warriner instead began writing chapters for a new book, which was published by Harcourt Brace as Warriner's Handbook of English, aimed at grades 9 and 10. This book was followed by a volume aimed at 11th and 12th graders.

  4. Category:English grammar books - Wikipedia

    en.wikipedia.org/wiki/Category:English_grammar_books

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Pages for logged out editors learn more

  5. English grammar - Wikipedia

    en.wikipedia.org/wiki/English_grammar

    The first published English grammar was a Pamphlet for Grammar of 1586, written by William Bullokar with the stated goal of demonstrating that English was just as rule-based as Latin. Bullokar's grammar was faithfully modeled on William Lily's Latin grammar, Rudimenta Grammatices (1534), used in English schools at that time, having been ...

  6. Mnemonics in trigonometry - Wikipedia

    en.wikipedia.org/wiki/Mnemonics_in_trigonometry

    Signs of trigonometric functions in each quadrant. All Students Take Calculus is a mnemonic for the sign of each trigonometric functions in each quadrant of the plane. The letters ASTC signify which of the trigonometric functions are positive, starting in the top right 1st quadrant and moving counterclockwise through quadrants 2 to 4.

  7. Wren & Martin - Wikipedia

    en.wikipedia.org/wiki/Wren_&_Martin

    Wren & Martin refers to a single book High School English Grammar and Composition or collectively, a series of English grammar textbooks written jointly by P. C. Wren and H. Martin. [1] Written primarily for the children of British officers residing in India , these books were widely adopted by Indian and Pakistani schools in the post-colonial ...

  8. List of trigonometric identities - Wikipedia

    en.wikipedia.org/wiki/List_of_trigonometric...

    A formula for computing the trigonometric identities for the one-third angle exists, but it requires finding the zeroes of the cubic equation 4x 3 − 3x + d = 0, where is the value of the cosine function at the one-third angle and d is the known value of the cosine function at the full angle.

  9. Longman Grammar of Spoken and Written English - Wikipedia

    en.wikipedia.org/wiki/Longman_Grammar_of_Spoken...

    While targeting "English language students and researchers" (p. 45), an abridged version of the grammar was released in 2002, Longman Student Grammar of Spoken and Written English, together with a workbook entitled Longman Student Grammar of Spoken and Written English Workbook, to be used by students on university and teacher-training courses.

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