4. Rewrite each pair of equations as one equation in terms of x and y.
e) x=3 cos A, y=4+ tan A
f) x = A sin C, y= B sec C
*2.5 for each, show steps.
e+ please do it if u know oO 10000000 THX
^o^"懂"就是聰明Maths (O嘴篇)
2010-09-22 1:30 am
回答 (1)
2010-09-22 1:50 am
✔ 最佳答案
4e)x=3 cos A, y=4+ tan ASol :y - 4 = tanA(y - 4)² = (1 - cos² A) / cos² A(y - 4)² = (1 - x²/9) / (x²/9)x² (y - 4)² = 9 - x²x² (1 + (y - 4)²) = 94f)x = A sin C, y= B sec CSol :1/y = (cos C) / BB / y = cos C .....(1)x / A = sin C .....(2)(1)² + (2)² :(x / A)² + (B / y)² = 1
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