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Question
sec6x - tan6x = 1 + 3sec2x × tan2x
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Solution
डावी बाजू = sec6x - tan6x
= (sec2x)3 - tan6x
= (1 + tan2x)3 - tan6x ......[∵ 1 + tan2θ = sec2θ]
= 1 + 3tan2x + 3(tan2x)2 + (tan2x)3 - tan6x .....[∵ (a + b)3 = a3 + 3a2b + 3ab2 + b3]
= 1 + 3tan2x (1 + tan2x) + tan6x - tan6x
= 1 + 3tan2x sec2x ......[∵ 1 + tan2θ = sec2θ]
= उजवी बाजू
∴ sec6x - tan6x = 1 + 3sec2x × tan2x
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cos2θ(1 + tan2θ) = 1
`tanθ/(secθ - 1) = (tanθ + secθ + 1)/(tanθ + secθ - 1)`
जर secθ = `13/12` , तर इतर त्रिकोणमितीय गुणोत्तरांच्या किमती काढा.
cot2θ - tan2θ = cosec2θ - sec2θ
`(tan^3θ - 1)/(tanθ - 1)` = sec2θ + tanθ
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
`(1 + sintheta)/(1 - sin theta)` = (sec θ + tan θ)2 हे सिद्ध करा.
`(cot "A" + "cosec A" - 1)/(cot"A" - "cosec A" + 1) = (1 + cos "A")/"sin A"` हे सिद्ध करा.
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.
