Period when two forces act together, from the periods under each force alone

1. A.
   $T=\sqrt{\frac{T_1^2+T_2^2}{T_1^2 T_2^2}}$
2. B.
   $T=\sqrt{\frac{T_1^2 T_2^2}{T_1^2+T_2^2}}$
3. C.
   $T=\sqrt{T_1^2 T_2^2}$
4. D.
   $T=\sqrt{T_1^2+T_2^2}$

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1. A.
   $T_1^2T_2^2$
2. B.
   $\dfrac{T_1^2}{T_2^2}$
3. C.
   $T_1^2 + T_2^2$
4. D.
   $\dfrac{T_1^2T_2^2}{(T_1^2 + T_2^2)}$

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