Question:
Prove cot\((\frac{\sqrt{1+sinx}+\sqrt{1-sinx}}{\sqrt{1+sinx}-\sqrt{1-sinx}}=\frac{x}{2},x∈[0,\frac{π}{4}]\)
Prove cot\((\frac{\sqrt{1+sinx}+\sqrt{1-sinx}}{\sqrt{1+sinx}-\sqrt{1-sinx}}=\frac{x}{2},x∈[0,\frac{π}{4}]\)
Updated On: Oct 11, 2023
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Solution and Explanation
consider\((\frac{\sqrt{1+sinx}+\sqrt{1-sinx}}{\sqrt{1+sinx}-\sqrt{1-sinx}}\)
\(=(\frac{(\sqrt{1+sinx}+\sqrt{1-sinx)^2}}{\sqrt{1+sinx)^2}-\sqrt{1-sinx)^2}}\)
\(=(\frac{(\sqrt{1+sinx}+\sqrt{1-sinx)^2}}{(\sqrt{1+sinx)^2}-\sqrt{1-sinx)^2}}\) ( by rationalizing)
\(=(\frac{1+sinx)+(1-sinx)+2√(1+sin x)(1-sin x)}{1+sinx-1+sin x}\)
=\(2\frac{1+√1-sin^2x)}{2sin x}=\frac{1+cosx}{sin x}\)=\(\frac{2cos^2\frac{x}{2}}{2sin^\frac{x}{2}cos\frac{x}{2}}\)
\(cot\frac{x}{2}\)
=L.H.S=cot-1 \((\frac{√1+sinx+√1-sinx}{√1+sinx-√1-sinx}\) =cot-1 \((cot\frac{x}{2})\)= R.H.S
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