Choose the correct alternative answer for the following questions.

(1) sin cosec = ?
(A) 1 (B) 0 (C) 1/2 (D) √2

Solution:
sin = 1/cosec
sin cosec =(1/cosec)×cosec = 1
Hence option A is the answer.

(2) cosec45° =?
(A) 1/√2 (B) √2 (C) √3/2 (D) 2/√3

Solution:
cosec45 = √2
Hence option B is the answer.

(3) 1 + tan² = ?
(A) cot² (B) cosec² (C) sec² (D) tan²

Solution:
1 + tan² = sec²
Hence option C is the answer.

(4) When we see at a higher level , from the horizontal line,angle formed is……. .
(A) angle of elevation. (B) angle of depression. (C) 0 (D) straight angle.

Solution:

When we see at a higher level , from the horizontal line,angle formed is angle of elevation.
Hence option A is the answer.