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Chapter 3 Trigonometric Functions Ex-3.3 Interview Questions Answers

Question 1 : Prove that:

Answer 1 :


Question 2 : Prove that: 

Answer 2 :


Here

= 1/2 + 4/4

= 1/2 + 1

= 3/2

= RHS

Question 3 : Prove that: 

Answer 3 :


Question 4 : Prove that: 

Answer 4 :


Question 5 :
Find the value of:
(i) sin 75o
(ii) tan 15o

Answer 5 :



(ii) tan 15°

It can be written as

= tan (45° – 30°)

Using formula

Question 6 : Prove that:

Answer 6 :


Question 7 : Prove that:

Answer 7 :


Question 8 : Prove that:

Answer 8 :


Question 9 : Prove that:

Answer 9 :

Consider

It can be written as

= sin x cos x (tan x + cot x)

So we get

Question 10 : Prove that: sin (n + 1)x sin (n + 2)x + cos (n + 1)x cos (n + 2)x = cos x

Answer 10 : LHS = sin (n + 1)x sin (n + 2)x + cos (n + 1)x cos (n + 2)x


Selected

 

Chapter 3 Trigonometric Functions Ex-3.3 Contributors

krishan

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