Fireburntbudder
26.06.2019 •
Mathematics
Ineed to know what number 11 and 15 are
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Ответ:
15. There are no scalene triangles
Ответ:
x = r cos θ , y = r sin θ
Or
x² = r² cos² θ , y² = r² sin² θ
To represent the Cartesian equation x²−y²=1
substitute with the values of x² and y²
∴ r² cos² θ - r² sin² θ = 1
r² (cos² θ - sin² θ) = 1
but cos² θ - sin² θ = cos 2θ
∴ r² cos 2θ = 1
r² = 1/cos 2θ
∴ r² = sec 2θ ⇒⇒⇒⇒ The required equation