RRB Junior Engineer Stage 1 Model Papers 5

Question : 10 of 100

Marks: +1, -0

What is the simplified value of

(1/{\cosec A+\cot A})^2

Solution:

{\cot A+\tan B}/{\cot B+\tan A}={\cot A+1/{\cot B}}/{\cot B+1/{\cot A}}

⇒{\cot A.\cot B+1}/{\cot B}/{\cot A.\cot B+1}/{\cot A}

⇒{\cot A}/{\cot B}=\cot A.\tan B

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