Forum

Introduction to Trignometry & its Equation

An observer 1.5 metres tall is 20.5 metres away from a tower 22 metres high. Determine  the  angle  of  elevation  of  the  top  of  the  tower  from  the  eye  of  the observer.

08/11/2024

Mathematics

10th

Introduction to Trignometry & its Equation

 If 2sin2θ – cos2θ = 2, then find the value of θ.

08/11/2024

Mathematics

10th

Introduction to Trignometry & its Equation

 Simplify (1 + tan2θ) (1 – sinθ) (1 + sinθ)

08/11/2024

Mathematics

10th

Introduction to Trignometry & its Equation

A ladder 15 metres long just reaches the top of a vertical wall. If the ladder makes an angle of 60° with the wall, find the height of the wall.

08/11/2024

Mathematics

10th

Introduction to Trignometry & its Equation

Prove that sin6θ + cos6θ + 3sin2θ cos2θ = 1

08/11/2024

Mathematics

10th

Introduction to Trignometry & its Equation

Write ‘True’ or ‘False’ and justify your answer.

If the height of a tower and the distance of the point of observation from its foot, both, are increased by 10%, then the angle of elevation of its top remains unchanged.

 

08/11/2024

Mathematics

10th

Introduction to Trignometry & its Equation

Write ‘True’ or ‘False’ and justify your answer.

The angle of elevation of the top of a tower is 30°. If the height of the tower is doubled, then the angle of elevation of its top will also be doubled.

08/11/2024

Mathematics

10th

Introduction to Trignometry & its Equation

Write ‘True’ or ‘False’ and justify your answer.

If a man standing on a platform 3 metres above the surface of a lake observes a cloud and its reflection in the lake, then the angle of elevation of the cloud is equal to the angle of depression of its reflection.

08/11/2024

Mathematics

10th

Introduction to Trignometry & its Equation

Write ‘True’ or ‘False’ and justify your answer.

If the length of the shadow of a tower is increasing, then the angle of elevation of the sun is also increasing.

08/11/2024

Mathematics

10th

Introduction to Trignometry & its Equation

Write ‘True’ or ‘False’ and justify your answer.

If cosA + cos2A = 1, then sin2A + sin4A = 1.

08/11/2024

Mathematics

10th