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प्रश्न
`(tan^3θ - 1)/(tanθ - 1)` = sec2θ + tanθ
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उत्तर
डावी बाजू = `(tan^3θ - 1)/(tanθ - 1) = (tan^3θ - 1^3)/(tanθ - 1)`
= `((tanθ - 1)(tan^2θ + tanθ + 1))/((tanθ - 1))` ......…[∵ a3 – b3 = (a - b) (a2 + ab + b2)]
= tan2θ + tan θ + 1
= (1 + tan2θ) + tan θ
= sec2θ + tan θ ......…[∵ 1 + tan2θ = sec2θ]
= उजवी बाजू
∴ `(tan^3θ - 1)/(tanθ - 1)` = sec2θ + tanθ
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संबंधित प्रश्न
(sec θ - cos θ)(cot θ + tan θ) = tan θ sec θ
(sec θ + tan θ) (1 - sin θ) = cos θ
`(sin θ - cos θ + 1)/(sin θ + cos θ - 1) = 1/(sec θ - tan θ)`
खालील प्रश्नासाठी उत्तराचा योग्य पर्याय निवडा.
`(1 + cot^2"A")/(1 + tan^2"A")` = ?
cot2θ × sec2θ = cot2θ + 1 हे सिद्ध करा.
`"tan A"/"cot A" = (sec^2"A")/("cosec"^2"A")` 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
जर sec θ = `41/40`, तर sin θ, cot θ, cosec θ च्या किमती काढा.
सिद्ध करा:
cotθ + tanθ = cosecθ × secθ
उकल:
डावी बाजू = cotθ + tanθ
= `cosθ/sinθ + sinθ/cosθ`
= `(square + square)/(sinθ xx cosθ)`
= `1/(sinθ xx cosθ)` ............... `square`
= `1/sinθ xx 1/square`
= cosecθ × secθ
= उजवी बाजू
∴ cotθ + tanθ = cosecθ × secθ
जर `1/sin^2θ - 1/cos^2θ-1/tan^2θ-1/cot^2θ-1/sec^2θ-1/("cosec"^2θ) = -3`, तर θ ची किमत काढा.
