Class 10 Ncert Concepts & Questions

If tan A = 1/√3, find all Trigonometric Ratios using Trigonometric Identities?

cot A = 1/tan A = 1/(1/√3) = √3 — (1)

Using Trigonometric Identity:

1 + tan²A = sec²A
1 + (1/√3)² = sec²A
sec²A = 1 + 1/3 = 4/3

sec A = +√(4/3) = +2/√3

or sec A = -2/√3 (neglecting this value as A is acute angle)

Therefore, sec A = 2/√3

Using Trigonometric Identity:

1 + cot²A = cosec²A
1 + (√3)² = cosec²A
4 = cosec²A

cosec A = 2

Again, sin A = 1/cosec A = 1/2

sin A = 1/2

cos A = 1/sec A = 1/(2/√3) = √3/2

Thus:

sin A = 1/2
cos A = √3/2
cot A = √3
cosec A = 2
sec A = 2/√3

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Aman Sir, the driving force behind Maths Vidya Institute, is known for his deep understanding of the CBSE Maths curriculum. Since 2009, he has been helping students from Class 9 to 12 score high marks through engaging online sessions, personalized feedback, and consistent performance reviews.
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