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प्रश्न
Prove that `log(secx)=1/2x^2+1/12x^4+.........`
योग
उत्तर
Let E = log (sec x)
= - log (cos x)
`=-log[1-(x^2/(2!)-x^4/(4!))]`
`=-[-(x^2/(2!)-x^4/(4!))-1/2(x^2/(2!)-x^4/(4!))+........]`
E = `log(secx)=1/2x^2+1/12x^4+.........`
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Logarithmic Functions
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