{(1/cosθ) + (1/cotθ)} {(1/cosθ) - (1/cotθ)} এর মান কত?
Solution
Correct Answer: Option C
{(1/cosθ) + (1/cotθ)} {(1/cosθ) - (1/cotθ)}
= (secθ + tanθ) (secθ - tanθ)
= sec2θ - tan2θ [যেহেতু, 1 + tan2θ = sec2θ]
= 1
= (secθ + tanθ) (secθ - tanθ)
= sec2θ - tan2θ [যেহেতু, 1 + tan2θ = sec2θ]
= 1
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