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Question
`(1 + sec "A")/"sec A" = (sin^2"A")/(1 - cos"A")` हे सिद्ध करा.
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Solution
डावी बाजू = `(1 + sec "A")/"sec A"`
= `1/"sec A" + "sec A"/"sec A"`
= cos A + 1
= `(1 + cos "A") xx (1 - cos"A")/(1 - cos"A")`
= `(1 - cos^2"A")/(1 - cos"A")`
= `(sin^2"A")/(1 - cos"A")` .......`[(because sin^2"A" + cos^2"A" = 1),(therefore 1 - cos^2"A" = sin^2"A")]`
= उजवी बाजू
∴ `(1 + sec "A")/"sec A" = (sin^2"A")/(1 - cos"A")`
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`(1 + cot^2"A")/(1 + tan^2"A")` = ?
cosec θ.`sqrt(1 - cos^2theta) = 1` हे सिद्ध करा.
(sec θ + tan θ) . (sec θ – tan θ) = ?
sin4A – cos4A = 1 – 2cos2A हे सिद्ध करण्यासाठी खालील कृती पूर्ण करा.
कृती: डावी बाजू = `square`
= (sin2A + cos2A) `(square)`
= `1 (square)` .....`[sin^2"A" + square = 1]`
= `square` – cos2A .....[sin2A = 1 – cos2A]
= `square`
= उजवी बाजू
`(cot "A" + "cosec A" - 1)/(cot"A" - "cosec A" + 1) = (1 + cos "A")/"sin A"` हे सिद्ध करा.
sin2θ + cos2θ ची किंमत काढा.
उकलः
Δ ABC मध्ये, ∠ABC = 90°, ∠C = θ°
AB2 + BC2 = `square` ...(पायथागोरसचे प्रमेय)
दोन्ही बाजूला AC2 ने भागून,
`"AB"^2/"AC"^2 + "BC"^2/"AC"^2 = "AC"^2/"AC"^2`
∴ `("AB"^2/"AC"^2) + ("BC"^2/"AC"^2) = 1`
परंतु `"AB"/"AC" = square "आणि" "BC"/"AC" = square`
∴ `sin^2 theta + cos^2 theta = square`
