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prove that sin^2θ/cosθ+cosθ=secθ

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Letter Writing (5 Marks) Look at the Notice Issued by the Supervisor of Your School

asked Sep 24, 2021 in Letter Writing by Doubtly (98.9k points)

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proove that v. cot θ + tan θ =cosec θ. sec θ

asked Sep 30, 2021 in Trigonometry by Doubtly (98.9k points)

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11. Identify the figures and explain their use.

asked Sep 27, 2021 in Chapter 4: Effects of electric current by Doubtly (98.9k points)

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Two tungsten bulbs of wattage 100 W and 60 W power work on 220 V potential difference. If they are connected in parallel, how much current will flow

asked Sep 25, 2021 in Chapter 4: Effects of electric current by anonymous

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d. On what basis and how will you determine whether air is saturated with vapour or not?

asked Sep 27, 2021 in Chapter 5: Heat by Doubtly (98.9k points)

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In the electric equipment producing heat e.g. iron, electric heater, boiler, toaster etc. an alloy such as Nichrome is used, not pure metals

asked Sep 26, 2021 in Chapter 4: Effects of electric current by Doubtly (98.9k points)

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8. Read the following paragraph and answer the questions.

asked Sep 27, 2021 in Chapter 5: Heat by Doubtly (98.9k points)

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proove that iv. (sec θ – cos θ) (cot θ + tan θ)= tan θ. sec θ

asked Sep 30, 2021 in Trigonometry by Doubtly (98.9k points)

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prove that cos^2 θ (1+ tan2 θ) = 1

asked Sep 30, 2021 in Trigonometry by Doubtly (98.9k points)

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prove that vi ) 1/secθ−tanθ=secθ+tanθ

asked Sep 30, 2021 in Trigonometry by Doubtly (98.9k points)

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Prove that √1-sinθ/1+sinθ=secθ−tanθ

asked Sep 30, 2021 in Trigonometry by Doubtly (98.9k points)

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(i). If the speed of light in a medium is 1.5 × 108 m/s, what is the absolute refractive index of the medium?

asked Sep 27, 2021 in Chapter 6: Refraction of light by Doubtly (98.9k points)

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Per capita land availability is more in Brazil as compared to India.

asked Sep 24, 2021 in Chapter 8: Economy and Occupations by Doubtly (98.9k points)

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A thermally insulated pot has 150 g ice at temperature 0°C. How much steam of 100°C has to be mixed to it, so that water of temperature 50°C will be obtained?

asked Sep 27, 2021 in Chapter 5: Heat by Doubtly (98.9k points)

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Proove that vii. sin^4 θ – cos^4 θ = 1 – 2 cos^2 θ

asked Sep 30, 2021 in Trigonometry by Doubtly (98.9k points)

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Electromagnetic induction means-

asked Sep 26, 2021 in Chapter 4: Effects of electric current by Doubtly (98.9k points)

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4.A calorimeter has mass 100 g and specific heat 0.1 kcal/ kg °C. It contains 250 gm of liquid at 30°C having specific heat of 0.4 kcal/kg °C.

asked Sep 27, 2021 in Chapter 5: Heat by Doubtly (98.9k points)

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proove that viii. } secθ+tanθ=cosθ/(1−sinθ)

asked Sep 30, 2021 in Trigonometry by Doubtly (98.9k points)

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A. What is the reason for the twinkling of stars? i . Explosions occurring in stars from time to time ii. Absorption of light in the earth’s atmosphere

asked Sep 27, 2021 in Chapter 6: Refraction of light by Doubtly (98.9k points)

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