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SSC Sample Paper SSC CHSL (10+2) Sample Test Paper-15

  • question_answer
    What is cot \[15{}^\circ \text{ }cot\text{ }20{}^\circ \text{ }cot\text{ }70{}^\circ \text{ }cot\text{ }75{}^\circ \]equal to?

    A) \[-1\]                            

    B) \[0\]

    C) \[1\] 

    D) \[2\]

    Correct Answer: C

    Solution :

    \[\cot 15{}^\circ .\,\cot \,20{}^\circ .\,\cot 70{}^\circ .\,\cot 75{}^\circ \] \[=\cot \,(90{}^\circ -75{}^\circ ).\,\,\cot \,20{}^\circ \,.\,\,\cot \,\,(90{}^\circ -20{}^\circ ).\,\cot \,75{}^\circ \] \[=\tan 75{}^\circ .\cot 20{}^\circ .\tan 20{}^\circ .\cot 75{}^\circ =\] \[=\,\,\,\]                                  


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