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        <div id="content-top1">Page 68 - maths_g10p2</div>
        <div id="content-top2">P. 68</div>
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    <pre style="white-space:pre-line"><code>Trigonometric Equations and Identities Ã¡Â«Ã£âˆÃ£Å¸G Ã¤â€™OÃ‰Â©Å¸Gh Ã¤Ã‰â‰¤HÃ‰Â£Ã Å¸G

                                15 = Â¢S2 - 2Â¢S Ã¡dOÃ‰Â©Å¸G ÃˆÃ YG
....... , 5- , 3 , 1- , 0 Ã¡Â«dÃ‰Ã dG Â¢S ÂºÂ«b â„¢Â«ÂªÃ· Ã¡Ã«Â«Ã«Â°U Ã¡dOÃ‰Â©Å¸G Ï€g

                                    1 = `g 2 Ã‰Ã L Ã¡dOÃ‰Â©Å¸G ÃˆÃ YG
                          90 , 30 , 0 : Ã¡Â«dÃ‰Ã dG ÂºÂ«â‰¤dÃ‰H `g âˆ«Ã³Ã‘Ã Â°SG
                        ? IÃ‰Â£Â©Å¸G ÂºÂ«â‰¤dG â„¢Â«ÂªÃ· Ã¡Ã«Â«Ã«Â°U Ã¡dOÃ‰Â©Å¸G Ï€g

                                                          âˆž`jÃ´`Â©J
ÂºÂ«â‰¤d Ã¡Ã«Â«Ã«Â°U Ã’Zh Ã’Â¨Ã Å¸G ÂºÂ«b Â¢â€ Â©Ã‘d Ã¡Ã«Â«Ã«Â°U Â¿Æ’Î¼J Ã¡Â«Â°VÃ‰jQ IQÃ‰Ã‘Y Â»g Ã¡dOÃ‰Â©Å¸G

              .Ã¡dOÃ‰Â©Å¸G Ï€M Ã¡YÆ’Âªâ€º Ã¡Ã«Â«Ã«Â°U IQÃ‰Ã‘Â©dG Ï€Â©Å’ Â»Ã dG ÂºÂ«â‰¤dG Ã¡YÆ’Âªâ€º â‰ˆÂªÂ°Ã¹Jh iÃ´NCG

  5                                           1 âˆ«Ã‰Ã£e

: 360 &lt; Â¢S  05 Â¿CÃ‰H Ã‰k ÂªâˆY Ã¡Â«JBâ€™G Ã¤â€™OÃ‰Â©Å¸G â‰¥â‰¤â€“ Â»Ã dG Â¢S ÂºÂ«b Ã³LhCG
                               1 = 1- Â¢S Ã‰L 2- ( CG
                                Ã´Ã˜Â°U = Â¢S Ã‰X - 1 (Ãœ

                                                 Ï€``â—ŠG

                                     1 = 1- Â¢S Ã‰L 2- (CG

                                     2 = Â¢S Ã‰L 2-

         ( Ã¡Â«Â©HQ Ã¡jhGR Â¢S Ã¡jhGÃµdG )  1- = Â¢S Ã‰L

                                     5    =  Â¢S  âˆ´

                                     270

                           Ã´Ã˜Â°U = Â¢S Ã‰X - 1 (Ãœ

                             1 = Â¢S Ã‰X
                     5225 , 45 5 = Â¢Sâˆ´

                                                 1 Ã–jQÃ³J

  5         Â¢S &lt; 05  Â¿CÃ‰H Ã‰k ÂªâˆY Ã¡Â«dÃ‰Ã dG Ã¤â€™OÃ‰Â©Å¸G Ï€M Ã¡YÆ’Âªâ€º Ã³LhCG

: 360 &lt;                                      1 = Â¢S 2Ã‰L (CG

                     Ã´Ã˜Â°U = ( Â¢S Ã‰L ) ( 3 - Â¢S Ã‰Ã L 2) (Ãœ

                     1- =             1      - `g Ã‰L 2 (`L
                                     `g Ã‰L

            66</code></pre>
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