1 + 2sin2θ cos2θ - sin4θ - cos4θ యొక్క గరిష్ట విలువ ఎంత, ఇక్కడ 0° < θ < 90° ?

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CDS 02/2021: Maths Previous Paper (Held On 14 Nov 2021)
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ఇచ్చినది:

త్రికోణమితీయ సమాసం is 1 + 2sin2θ cos2θ - sin4θ - cos4θ ఇక్కడ 0° < θ < 90°

ఉపయోగించిన సూత్రం:

2sinθ.cosθ = sin2θ 

sin2θ + cos2θ = 1

a2 + b2 = (a + b)2 - 2ab

గణన:

మన వద్ద ఉన్నది 1 + 2sin2θ cos2θ - sin4θ - cos4θ

⇒ 1 + 2sin2θ cos2θ - (sin4θ + cos4θ)

⇒ 1 + 2sin2θ cos2θ - [(sin2θ)2 + (cos2θ)2]

⇒ 1 + 2sin2θ cos2θ - [(sin2θ + cos2θ)2 - 2sin2θcos2θ]

⇒ 1 + 2sin2θ cos2θ - 1 + 2sin2θcos2θ

⇒ 4sin2θ cos2θ

⇒ (2sinθ.cosθ)2

⇒ (sin2θ)2

⇒ sin2

x = 90° వద్ద sin2x = 1 యొక్క గరిష్ట విలువ 

∴ 2θ = 90° వద్ద sin22θ = 1 యొక్క గరిష్ట విలువ

i.e θ = 45° ఇది ఇచ్చిన షరతును సంతృప్తిపరుస్తుంది

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