Two particles are projected from the same point with the same speed at different angles${\theta }_1\text{and}{\theta }_2$  to the horizontal. If their respective times of flights are ${\text{T}}_1\text{and}{\text{T}}_2$ and horizontal ranges are same then

a) ${\theta }_1\text{+}{\theta }_2=90°$                         b) ${\text{T}}_1\text{=}{\text{T}}_2\tan {\theta }_1$             c) ${\text{T}}_1\text{=}{\text{T}}_2\tan {\theta }_2$

d)${\text{T}}_1\text{sin}{\theta }_2\text{=}{\text{T}}_2\sin {\theta }_1$