# 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:

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

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

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

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

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

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

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

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

Question 3 - Evaluate:

Solution:

Solution:

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

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

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

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

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

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