If sin17∘=xy, then the value of sec17∘−sin73∘ will be
y2x√y2−x2
x2y√y2−x2
x2y√x2−y2
y2x√x2−y2
We know 73∘+17∘=90∘
∴ sec 17∘=y√y2−x2
sin 73∘=√y2−x2y
sec 17∘−sin 73∘ =y√y2−x2−√y2−x2y=y2−(y2−x2)y√y2−x2=y2−y2+x2y√y2−x2=x2y√y2−x2
If x2+y2x2−y2=178, then xy?
Find the orthogonal trajectory of x2+y2=c