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Question
cos2θ(1 + tan2θ) = 1
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Solution
डावी बाजू = cos2θ(1 + tan2θ)
= cos2θ . sec2θ .....[∵ 1 + tan2θ = sec2θ]
= cos2θ . `1/cos^2θ` ....`[∵ secθ = 1/cosθ]`
= 1
= उजवी बाजू
∴ cos2θ(1 + tan2θ) = 1
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cot2θ - tan2θ = cosec2θ - sec2θ
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`(tan^3θ - 1)/(tanθ - 1)` = sec2θ + tanθ
`costheta/(1 + sintheta) = (1 - sintheta)/(costheta)` हे सिद्ध करा.
tan2θ – sin2θ = tan2θ × sin2θ हे सिद्ध करण्यासाठी खालील कृती पूर्ण करा.
कृती: डावी बाजू = `square`
= `square (1 - (sin^2theta)/(tan^2theta))`
= `tan^2theta (1 - square/((sin^2theta)/(cos^2theta)))`
= `tan^2theta (1 - (sin^2theta)/1 xx (cos^2theta)/square)`
= `tan^2theta (1 - square)`
= `tan^2theta xx square` .....[1 – cos2θ = sin2θ]
= उजवी बाजू
`sqrt((1 + cos "A")/(1 - cos"A"))` = cosec A + cot A हे सिद्ध करा.
sec2θ – cos2θ = tan2θ + sin2θ हे सिद्ध करा.
