ข้อสอบ A-Level คณิตประยุกต์ 1 ปี 2560 (วิชาสามัญเก่า)

ข้อ 3

กำหนดให้ straight A comma straight B element of open parentheses 0 comma straight pi over 2 close parentheses  ถ้า tanA equals 2 และ tanB equals 3 แล้ว straight A plus straight B มีค่าเท่ากับข้อใดต่อไปนี้

รีวิว - เสียงตอบรับจากผู้เรียน

เฉลยข้อสอบ

begin mathsize 12px style แสดงว ่ า space space space space space open square brackets 7 plus open parentheses negative 5 close parentheses close square brackets to the power of 6 space equals space sum from r equals 0 to 6 of open parentheses table row 6 row r end table close parentheses times 7 to the power of 6 minus r end exponent times open parentheses negative 5 close parentheses to the power of r
space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space sum from r equals 0 to 6 of open parentheses table row 6 row r end table close parentheses times 7 to the power of 6 minus r end exponent times open parentheses negative 1 close parentheses to the power of r times 5 to the power of r
space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space sum from r equals 0 to 6 of open parentheses negative 1 close parentheses to the power of r open parentheses table row 6 row r end table close parentheses times 7 to the power of 6 minus r end exponent times 5 to the power of r

ด ั งน ั้ น space space space space space space space space space space sum from r equals 0 to 6 of open parentheses negative 1 close parentheses to the power of r open parentheses table row 6 row r end table close parentheses times 7 to the power of 6 minus r end exponent times 5 to the power of r space equals space open square brackets 7 plus open parentheses negative 5 close parentheses close square brackets to the power of 6 space
space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space open parentheses 7 minus 5 close parentheses to the power of 6 space equals space 2 to the power of 6
space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space 64 end style   
                  
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