If 1+sinθ=xcosθ,then tanθ=?

A (x²+1)/x

B (x²-1)/x

C (x²+1)/2x

D (x²-1)/2x

Solution

Correct Answer: Option D

দেওয়া আছে ,
1+sinθ=xcosθ
⇒ (1+sinθ)/cosθ=x
⇒ 1/cosθ+sinθ/cosθ=x
∴ secθ+tanθ=x..............i

আমরা জানি ,
sec²θ-tan²θ=1
⇒ (secθ+tanθ)(secθ-tanθ)=1
⇒ x(secθ-tanθ)=1
⇒ secθ-tanθ=1/x
⇒ secθ-1/x=tanθ
⇒ x-tanθ-1/x=tanθ
⇒ x-1/x=tanθ+tanθ
⇒ (x²-1)/2x=tanθ
∴ tanθ=(x²-1)/2x

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