A) \[1\]
B) \[2\]
C) \[3\]
D) \[4\]
Correct Answer: A
Solution :
Now, \[\tan {{45}^{o}}=\tan ({{25}^{o}}+{{20}^{o}})\]--- \[\Rightarrow \] \[1=\frac{\tan {{25}^{o}}+\tan {{20}^{o}}}{1-\tan {{25}^{o}}\,\tan \,{{20}^{o}}}\] \[\Rightarrow \] \[\tan {{25}^{o}}+\tan {{20}^{o}}+\tan {{25}^{o}}\tan {{20}^{o}}=1\]You need to login to perform this action.
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