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Trigonometry Class 10

Trigonometry: Introductory Videos Introduction to Trigonometry (For All Boards): Class 10: Part 1 In this section we will try to understand: 1) What is trigonometry and 2) the basic terms involved in the trigonometry like sin, cos, tan, cot, sec and cosec. https://www.youtube.com/watch?v=lCeer92qsHs Introduction to Trigonometry (For All Boards): Class 10: Part 2 In this video, I am trying to explain the basic meaning and definition of sin, cos, tan, cot, sec and cosec. https://www.youtube.com/watch?v=x50kbKT3dIQ I n troduction to Trigonometry (For All Boards): Class 10: Part 3 In this video you will learn how to remember trigonometric ratios. https://www.youtube.com/watch?v=dCxGcWoQPbI Introduction to Trigonometry (For All Boards): Class 10: Part 4 In this video you will learn about trigonometric table. You will also learn the technique to remember the values inside the table. https://www.youtube.com/watch?v=NUOM87E5HeM Introduction to Trigo
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[(1-sinθcosθ) / cosθ(secθ - cosecθ) ] x [(sin²θ - cos²θ) / (sin³ + cos³θ)] = sinθ

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(SinA + CosecA)² + (CosA + SecA)² = 7 + tan² + cot²A

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(1+(1/tan²A))(1+(1/cot²A)) = (1/ (sin²A-sin^4A)

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In a right angled triangle ABC, AngleA=90° and (5sin²B + 7cos²C + 4)/(3 + 8tan²60) = 7/27.

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A straight highway leads to the foot of tower. A man standing at the top of tower observes a car at an angle of depression of 30°, which is approaching the foot of the tower with uniform speed. Six seconds later the angle of depression of the car is found to be 60°. Find the time taken by the car to reach the foot of the tower from this point.

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Prove that, (1+sinx-cosx)/(1+sinx+cosx)+(1+sinx+cosx)/(1+sinx-cosx) = 2cosecx

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If secθ - tanθ = P. Obtain the values of tanθ, secθ and sinθ in terms of P.

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Prove that (1 + tanθ)² + (1 + cotθ)² = (secθ + cosecθ)²

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tanA/(secA-1) + tanA/(secA+1) = 2cosecA

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A 1.5m tall boy is standing at some distance from a 30m tall building. The angle of elevation from his eyes to the top of building increases from 30° to 60° as he walks towards the building. Find the distance he walked towards the building.

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IF √(1+x²) sinθ = x, Prove that, tan²θ + cot²θ = x²+(1/x²).

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A pilot in an aeroplane observes that vashi bridge is on one side of the plane and worli sea-link is just on the opposite side. The angle of depression of vashi bridge and worli sea-link are 60° and 30° respectively. If the aeroplane is at a height of 5500√3 m at that time, what is the distance between vashi bridge and worli-sealink?.

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P is the circumcentre of an acute angled triangle ABC with circumradius R. Midpoint of BC is D. Show that the perimeter of △ABC is 2R (SinA + SinB + SinC).

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A bird was flying in a line parallel to the ground from north to south at a height of 2000 mtrs. Tom standing in the middle of the field, first he observed the bird in the north at an angle of 30°. After 3 minutes, he again observed it in the south at an angle of 45°. Find the speed of the bird in kilometers per hour. (√3 = 1.73).

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