NCERT Class 10 Chapter 8 Trigonometry Official CBSE Board Sample Problems Short Answer

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Question

Prove that

Solution

LHS

(Rationalizing the denominator of I fraction by )

RHS=

(Rationalizing the denominator of 2nd fraction by

Now, LHS = RHS Hence proved

Question

Given , find the other trigonometric ratios of the angle A.

Solution

Given:

As

Now,

Also,

As

Question

Write the values of and . What happens to sec x when x increases from to ?

Solution

Angles
Angles (θ) 0° 30° 45° 60° 90° secθ 1 2/√3 √2 2 Not defined

Angles ()

1

2

Not defined

The value of sec x increases and finally reaches to not defined limit as x increases from to .

Question

If find the value of A.

Solution

Question

If , prove that

Solution

Question

If and

Find the value of

Solution

=1

Question

If , then find the value of

Solution

Question

Evaluate:

Solution

Question

If , where 5A and 4A are acute angles, find the value of A.

Solution

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