Kamlesh Kumar

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26/05/2026

Prove that (√3 + 1) (3 – cot 30°) = tan360° – 2 sin 60°.

Solution:

LHS = (√3 + 1)(3 – cot 30°)

= (√3 + 1)(3 – √3)

= 3√3 – √3.√3 + 3 – √3

= 2√3 – 3 + 3

= 2√3

RHS = tan360° – 2 sin 60°

= (√3)3 – 2(√3/2)

= 3√3 – √3

= 2√3

Therefore, (√3 + 1) (3 – cot 30°) = tan360° – 2 sin 60°.

Hence proved.

26/05/2026

Prove that (sin4θ – cos4θ +1) cosec2θ = 2

Solution:

L.H.S. = (sin4θ – cos4θ +1) cosec2θ

= [(sin2θ – cos2θ) (sin2θ + cos2θ) + 1] cosec2θ

Using the identity sin2A + cos2A = 1,

= (sin2θ – cos2θ + 1) cosec2θ

= [sin2θ – (1 – sin2θ) + 1] cosec2θ

= 2 sin2θ cosec2θ

= 2 sin2θ (1/sin2θ)

= 2

= RHS

21/05/2026

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