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០៩២ ៧៧៤៤៤០ ឆន ំសិក ២០១៦-២០១៧<br />
េយ 1 <br />
<br />
cos េនះ cos cos នំឱយ <br />
2 3<br />
3 3<br />
<br />
ឃ). a 2,1 , b 3, 6<br />
<br />
មរូបមន្ត ab ab 1 1ab<br />
2 2<br />
<br />
<br />
េយើងមន a 2,1 , b 3, 6<br />
េនះ a b ab a b <br />
<br />
<br />
<br />
1 1 2 223 16 0<br />
<br />
ab<br />
<br />
េហើយ cos<br />
0<br />
នំឱយ <br />
ab<br />
2<br />
<br />
២១. ក). គណនផលគុណក ែល ABCB<br />
េយើងមន<br />
<br />
AB CB AB CB cos ABC<br />
<br />
ែដល AB<br />
a<br />
េយ ្រតីេកណ ABC ជ្រតីេកណែកងសមបត<br />
េនះ ABC<br />
180<br />
<br />
នំឱយ A2B180<br />
<br />
នំឱយ<br />
<br />
180 A<br />
180 90<br />
B 45<br />
2 2<br />
<br />
េរៀបេរៀងេយ៖ ЯĊŲ Ю₤₣lН₣ Page 62
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