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Question
sec2θ + cosec2θ = sec2θ × cosec2θ
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Solution
डावी बाजू = sec2θ + cosec2θ
= `1/cos^2θ + 1/sin^2θ`
= `(sin^2θ + cos^2θ)/(cos^2θ . sin^2θ)`
= `1/(cos^2θ.sin^2θ)` .....[∵ sin2θ + cos2θ = 1]
= `1/cos^2θ xx 1/sin^2θ`
=`sec^2θ xx "cosec"^2θ`
= उजवी बाजू
∴ sec2θ + cosec2θ = sec2θ × cosec2θ
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sec2θ + cosec2θ = sec2θ × cosec2θ हे सिद्ध करा.
`(tan(90 - theta) + cot(90 - theta))/("cosec" theta)` = sec θ हे सिद्ध करा.
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