Q. 135.0( 2 Votes )

# Evaluate.

Answer : (i) We know sin 45° = (1/√2) and cos 45° = (1/√2) (From the table)  (ii) We know sin 30° = 1/2 and tan 45° = 1 (From the table) (iii) We know tan 30° = (1/√3) (From the table)

tan 45° = 1

tan 60° = √3   (iv) We know sin 30° = cos 60° = 1/2 (From the table)

tan 30° = cot 60° = 1/√3    (v) We know that cos 90° = 0 , sin 90° = 1 and tan 45° = 1 (From the table)

6(0)2 + 3(1)2 + 4(1)2

3 + 4

7

(vi) We know cot 60° = (1/√3) (From the table)

sec 30° = 2/√3

sin 45° = 1/√2

sin 60° = √3/2

cos 45° = 1/√2    (vii) We know tan 60° = √3 (From the table)

cos 45° = 1/√2

sec 30° = 2/√3

cos 90° = 0

cosec 30° = 2

sec 60° = 2

cot 30° = √3  9

(viii) We know

sin 30° = cos 60° = 1/2 (From the table)

cos 45° = 1/√2

sin 90° = 1

4( 4( 4( 2

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