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Question
जर tan θ – sin2θ = cos2θ, तर sin2θ = `1/2` हे दाखवा.
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Solution
tan θ – sin2θ = cos2θ ......[Given]
∴ tan θ = sin2θ + cos2θ
∴ tan θ = 1 ....[∵ sin2θ + cos2θ = 1]
परंतु, tan 45° = 1
∴ tan θ = tan 45°
∴ θ = 45°
sin2θ = sin245°
= `(1/sqrt(2))^2`
= `1/2`
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secθ + tanθ = `cosθ/(1 - sinθ)`
1 + tan2θ = किती?
cot2θ - tan2θ = cosec2θ - sec2θ
(sec θ + tan θ) . (sec θ – tan θ) = ?
जर tan θ + cot θ = 2, तर tan2θ + cot2θ = ?
sec2θ + cosec2θ = sec2θ × cosec2θ हे सिद्ध करा.
`(sintheta + "cosec" theta)/sin theta` = 2 + cot2θ हे सिद्ध करा.
sin θ (1 – tan θ) – cos θ (1 – cot θ) = cosec θ – sec θ 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
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`
