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प्रश्न
θ चे निरसन करा:
जर x = r cosθ आणि y = r sinθ
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उत्तर
x = r cosθ
y = r sinθ
x2 = r2 cos2θ
∵ `x^2/r^2 = cos^2theta` ...(1)
`y^2 = r^2sin^2theta`
`y^2/x^2 = sin^2theta`
`sin^2theta + cos^2theta = 1`
`y^2/r^2 + x^2/r^2 = 1` ...[सूत्र]
∴ `(x^2 + y^2)/r^2 = 1`
∴ `x^2 + y^2 = r^2`
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संबंधित प्रश्न
`sqrt((1 - sinθ)/(1 + sinθ))` = secθ - tanθ
secθ + tanθ = `cosθ/(1 - sinθ)`
sec4A(1 - sin4A) - 2tan2A = 1
`(tan^3θ - 1)/(tanθ - 1)` = sec2θ + tanθ
`(cos^2theta)/(sintheta) + sintheta` = cosec θ हे सिद्ध करा.
sec2θ – cos2θ = tan2θ + sin2θ हे सिद्ध करा.
sec2A – cosec2A = `(2sin^2"A" - 1)/(sin^2"A"*cos^2"A")` हे सिद्ध करा.
जर cos A = `(2sqrt("m"))/("m" + 1)`, असेल, तर सिद्ध करा cosec A = `("m" + 1)/("m" - 1)`
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.
