circle

Question: If the line y $\cos \alpha =x\sin \alpha +a\cos \alpha $ be a tangent to the circle ${{x}^{2}}+{{y}^{2}}={{a}^{2}}$ , then

1) ${{\sin }^{2}}\alpha =1$

2) ${{\cos }^{2}}\alpha =1$

3) ${{\sin }^{2}}\alpha ={{a}^{2}}$

4) ${{\cos }^{2}}\alpha ={{a}^{2}}$

Solution:

Explanation: No Explanation

Tangent and normal to a circle

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