NCERT Solutions of Introduction to Trigonometry Class 10
<< NCERT Solution of Exercise 8.3NCERT Solution of Exercise 8.4 (Part - II) >>

Introduction to Trigonometry

NCERT Solution of
Exercise 8.4 (Part - I)

Question 1 - Express the trigonometric ratios sin A, sec A and tan A in terms of cot A.

Solution: sin A can be expressed in terms of cot A, as follows:

class ten math trigonometry ncert solution11 of Exercise 8.4

sec A can be expressed in terms of cot A, as follows:

class ten math trigonometry ncert solution12 of Exercise 8.4

tan A can be expressed in terms of cot A, as follows:

class ten math trigonometry ncert solution13 of Exercise 8.4

Question 2 - Write all the other trigonometric ratios of ƒA in terms of sec A.

Solution: Sin A can be written in terms of sec A as follows:

class ten math trigonometry ncert solution14 of Exercise 8.4

cos A can be written in terms of sec A as follows:

class ten math trigonometry ncert solution15 of Exercise 8.4

tan A can be written in terms of sec A as follows:

class ten math trigonometry ncert solution16 of Exercise 8.4

cosec A can be written in terms of sec A as follows:

class ten math trigonometry ncert solution17 of Exercise 8.4

cot A can be written in terms of sec A as follows:

class ten math trigonometry ncert solution18 of Exercise 8.4

Question 3 - Evaluate:

class ten math trigonometry ncert solution9 of Exercise 8.4

Solution:

class ten math trigonometry ncert solution10 of Exercise 8.4

Solution:

class ten math trigonometry ncert solution11 of Exercise 8.4

Question 4 - Choose the correct option. Justify your choice.

class ten math trigonometry ncert solution12 of Exercise 8.4

Solution: (b) is the correct option. Following is the explanation:

class ten math trigonometry ncert solution13 of Exercise 8.4

Solution: (c) is the correct option. Following is the explanation:

class ten math trigonometry ncert solution14 of Exercise 8.4
class ten math trigonometry ncert solution15 of Exercise 8.4

Solution: (d) is the correct option. Following is the explanation:

class ten math trigonometry ncert solution16 of Exercise 8.4
class ten math trigonometry ncert solution17 of Exercise 8.4

Solution: (d) is the correct option. Following is the explanation:

class ten math trigonometry ncert solution18 of Exercise 8.4

NCERT Solutions of Introduction to Trigonometry Class 10
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