Tristabergeron5650
30.07.2019 •
Mathematics
Eliminate the parameter, t, in the parametric equations, x = 2cost and y = 4sint. x2 + y2 = 4 x2 + y2 = 16 4x2 + y2 = 16 x2 + 2y2 = 16
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Ответ:
4x^2 + y^2= 16
Step-by-step explanation:
x= 2cost
y=4sint
x= x/2
y=y/4
use equation;
sin^2x + cos^2x= 1
replace:
(y/4)^2 + (x/2)^2=1
y^2/16 + x^2/4= 1
y^2+4x^2/16=1
y^2+x^2=16
rearrange:
4x^2 + y^2= 16
Ответ:
9
Step-by-step explanation:
x + 3 = 12 (both sides of triangle are equal, because angles are equal)
x= 12 - 3
x = 9