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प्रश्न
sin θ (1 – tan θ) – cos θ (1 – cot θ) = cosec θ – sec θ हे सिद्ध करा.
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उत्तर
डावी बाजू = sin θ (1 – tan θ) – cos θ (1 – cot θ)
= `sintheta (1 - (sintheta)/(costheta)) - costheta (1 - (costheta)/(sintheta))`
= `sintheta - (sin^2theta)/costheta - costheta + (cos^2theta)/sintheta`
= `sintheta + (cos^2theta)/sintheta - (sin^2theta)/costheta - costheta`
= `(sin^2theta + cos^2theta)/sintheta - ((sin^2theta + cos^2theta)/costheta)`
= `1/sintheta - 1/costheta` ......[∵ sin2θ + cos2θ = 1]
= cosec θ – sec θ
= उजवी बाजू
∴ sin θ (1 – tan θ) – cos θ (1 – cot θ) = cosec θ – sec θ
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संबंधित प्रश्न
`sqrt((1 - sinθ)/(1 + sinθ))` = secθ - tanθ
cot θ + tan θ = cosec θ sec θ
`tanA/(1 + tan^2A)^2 + cotA/(1 + cot^2A)^2` = sin A cos A
`(sin θ - cos θ + 1)/(sin θ + cos θ - 1) = 1/(sec θ - tan θ)`
जर 1 – cos2θ = `1/4`, तर θ = ?
cos2θ . (1 + tan2θ) = 1 हे सिद्ध करण्यासाठी खालील कृती पूर्ण करा.
कृती: डावी बाजू = `square`
= `cos^2theta xx square` .........`[1 + tan^2theta = square]`
= `(cos theta xx square)^2`
= 12
= 1
= उजवी बाजू
`costheta/(1 + sintheta) = (1 - sintheta)/(costheta)` हे सिद्ध करा.
sin6A + cos6A = 1 – 3sin2A . cos2A हे सिद्ध करा.
(1 – cos2A) . sec2B + tan2B (1 – sin2A) = sin2A + tan2B हे सिद्ध करा.
(sin A + cos A) (cosec A – sec A) = cosec A . sec A – 2 tan A हे सिद्ध करा.
