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Question
`(1 + sin "B")/"cos B" + "cos B"/(1 + sin "B")` = 2 sec B हे सिद्ध करा.
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Solution
डावी बाजू = `(1 + sin "B")/"cos B" + "cos B"/(1 + sin "B")`
= `((1 +sin "B")^2 + cos^2"B")/(cos "B"(1 + sin "B"))`
= `(1 +2sin"B" + sin^2"B" + cos^2"B")/(cos"B"(1 + sin"B"))` ......[∵ (a + b)2 = a2 + 2ab + b2]
= `(1 + 2sin"B" + 1)/(cos"B"(1+ sin"B"))` .....[∵ sin2B + cos2B = 1]
= `(2 + 2sin"B")/(cos"B"(1 + sin"B"))`
= `(2(1 + sin"B"))/(cos"B"(1 + sin"B"))`
= `2/"cos B"`
= 2 sec B
= उजवी बाजू
∴ `(1 + sin "B")/"cos B" + "cos B"/(1 + sin "B")` = 2 sec B
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RELATED QUESTIONS
`(sin^2θ)/(cosθ) + cosθ = secθ`
(sec θ - cos θ)(cot θ + tan θ) = tan θ sec θ
sec θ(1 - sin θ) (sec θ + tan θ) = 1
`1/(1 - sinθ) + 1/(1 + sinθ)` = 2sec2θ
जर sec θ + tan θ = `sqrt(3)`, तर secθ – tanθ ची किंमत काढण्यासाठी खालील कृती पूर्ण करा.
कृती: `square` = 1 + tan2θ ......[त्रि. नित्य समीकरण]
`square` – tan2θ = 1
(sec θ + tan θ) . (sec θ – tan θ) = `square`
`sqrt(3)*(sectheta - tan theta)` = 1
(sec θ – tan θ) = `square`
cot2θ × sec2θ = cot2θ + 1 हे सिद्ध करा.
`"tan A"/"cot A" = (sec^2"A")/("cosec"^2"A")` हे सिद्ध करा.
`sintheta/(sectheta+ 1) +sintheta/(sectheta - 1)` = 2 cot θ हे सिद्ध करा.
sin θ (1 – tan θ) – cos θ (1 – cot θ) = cosec θ – sec θ 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`
