Advertisements
Advertisements
Question
(sin A + cos A) (cosec A – sec A) = cosec A . sec A – 2 tan A हे सिद्ध करा.
Advertisements
Solution
डावी बाजू = (sin A + cos A) (cosec A – sec A)
= (sin A + cos A) `(1/sin A - 1/cos A)`
= (cos A + sin A) `((cosA - sinA)/(sinA cosA))`
= `(cos^2A - sin^2A)/(sinA cosA)` ...........[(a + b)(a - b) = a2 - b2]
= `(1 - sin^2A - sin^2A)/(sin A cosA)` .....`[(sin^2A + cos^2A = 1), (therefore1 - sin^2A = cos^2A)]`
= `(1 - 2sin^2A)/(sinA cosA)`
= `(1/(sinA cosA) - (2sin^2A)/(sinA cosA))`
= `1/sinA . 1/cosA - (2sinA)/cosA`
= cosec A. sec A – 2tan A
= उजवी बाजू
APPEARS IN
RELATED QUESTIONS
`sqrt((1 - sinθ)/(1 + sinθ))` = secθ - tanθ
sec4A(1 - sin4A) - 2tan2A = 1
sec6x - tan6x = 1 + 3sec2x × tan2x
`tanθ/(secθ + 1) = (secθ - 1)/tanθ`
sec2θ + cosec2θ = sec2θ × cosec2θ हे सिद्ध करा.
`sintheta/(sectheta+ 1) +sintheta/(sectheta - 1)` = 2 cot θ हे सिद्ध करा.
`sec"A"/(tan "A" + cot "A")` = sin A हे सिद्ध करा.
sec2θ – cos2θ = tan2θ + sin2θ हे सिद्ध करा.
2(sin6A + cos6A) – 3(sin4A + cos4A) + 1 = 0 हे सिद्ध करा.
जर sin θ + cos θ = `sqrt(3)`, तर tan θ + cot θ = 1 हे दाखवा.
