Chapter 8 – Introduction to Trigonometry
The angle of elevation of a cloud from a point h metres above the surface of a lake is θ and the angle of depression of its reflection in the lake is ϕ. Prove that the height of the cloud above the lake surface is h( tanϕ−tanθ/ tanϕ+tanθ ).
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Nov
The angle of elevation of a cloud from a point h metres above the surface of a lake is θ and the angle of depression of its reflection in the lake is ϕ. Prove that the height of the cloud above the lake surface is h( tanϕ−tanθ/ tanϕ+tanθ ). tanθ increases faster than sinθ as [...]
From a balloon vertically above a straight road the angles of depression of two cars at an instant are found to be 45° and 60°. If the cars are 100 m apart find the height of the balloon.
25
Nov
From a balloon vertically above a straight road the angles of depression of two cars at an instant are found to be 45° and 60°. If the cars are 100 m apart find the height of the balloon. From a balloon vertically above a straight road the angles of depression of two cars at an [...]
A spherical balloon of radius r subtends an angle α at the eye of an observer, while the angle of elevation of its centre is β. The height of the centre of the balloon is:
25
Nov
A spherical balloon of radius r subtends an angle α at the eye of an observer, while the angle of elevation of its centre is β. The height of the centre of the balloon is: A spherical balloon of radius r subtends an angle α at the eye of an observer while the angle of [...]
If sin theta + cos theta =root 3 then prove that tan theta + cot theta = 1
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Nov
If sin theta + cos theta =root 3 then prove that tan theta + cot theta = 1 If sin theta + cos theta =root 3 then prove that tan theta + cot theta = 1 November 25, 2020 Category: Chapter 8 - Introduction to Trigonometry , Maths , NCERT Class 10 ,
given that alpha + beta =90 degree show that square root cos alpha cosec beta – cos alpha sin beta= sin alpha
25
Nov
given that alpha + beta =90 degree show that square root cos alpha cosec beta – cos alpha sin beta= sin alpha given that alpha + beta =90 degree show that square root cos alpha cosec beta - cos alpha sin beta= sin alpha November 25, 2020 Category: Chapter 8 - Introduction to Trigonometry , [...]
Prove that: [sin^4 theta – cos^4 theta + 1]cosec^2 theta=2
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Nov
Prove that: [sin^4 theta – cos^4 theta + 1]cosec^2 theta=2 Prove that: [sin^4 theta - cos^4 theta + 1]cosec^2 theta=2 November 25, 2020 Category: Chapter 8 - Introduction to Trigonometry , Maths , NCERT Class 10 ,
Prove that : sin^6θ + cos^6θ + 3sin^2θ cos^2θ = 1.
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Nov
Prove that : sin^6θ + cos^6θ + 3sin^2θ cos^2θ = 1. Prove that : sin^6θ + cos^6θ + 3sin^2θ cos^2θ = 1. November 25, 2020 Category: Chapter 8 - Introduction to Trigonometry , Maths , NCERT Class 10 ,
The value of sin theta is a+1/a where a is a positive number
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Nov
The value of sin theta is a+1/a where a is a positive number The value of sin theta is a+1/a where a is a positive number November 25, 2020 Category: Chapter 8 - Introduction to Trigonometry , Maths , NCERT Class 10 ,
tanθ increases faster than sinθ as θ increases.
25
Nov
tanθ increases faster than sinθ as θ increases. tanθ increases faster than sinθ as θ increases. November 25, 2020 Category: Chapter 8 - Introduction to Trigonometry , Maths , NCERT Class 10 ,
The value of tanθ (θ < 90^∘) increases as θ increases.
25
Nov
The value of tanθ (θ < 90^∘) increases as θ increases. The value of tanθ (θ < 90^∘) increases as θ increases. November 25, 2020 Category: Chapter 8 - Introduction to Trigonometry , Maths , NCERT Class 10 ,