Trigonometric Ratios CBSE NCERT Solutions Chapter 8 Exercise 8.2 Question 2
2. Choose the correct option and justify your choice:
You can check here values of six trigonometric ratios (sin, cos, tan, sec, cot and cosec) for 0, 30, 45, 60 and 90 degrees. You can also learn from this article about how to memorize all the values in an easy way.
(i)
(A)
(B)
(C) tan 60
(D) sin
Solution:
is also equal to
.
Therefore, answer is (A).
(ii)
(A) tan 90
(B) 1 (C) sin 45
(D) 0
Solution:
Therefore, the answer is (D)
(iii)
sin 2A = 2 sin A is true when A =
(A) 0
(B) 30
(C) 45
(D) 60
Solution:
sin 2(0) = sin 0
= 0
2 sin (0) = 2 x 0 = 0
Therefore, answer is (A).
(iv)
(A) cos 60
(B) sin 60
(C) tan 60
(D) sin 30
Solution:
tan 60
is also equal to
Therefore, the answer is (C).
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