MCQ
If $A+B+C=90^{\circ}$, then the value of $\tan (B+C)$ is :
- A$\tan A$
- B$-\tan A$
- ✓$\cot A$
- D$-\cot A$
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$(x - y +1)^2 + (2x + 2y - 6)^2 = 20$ on any tangent will be