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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