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Question

Prove that sin 49.tan 11.sec 41.tan 79=1  [2 MARKS]


Solution

Concept: 1 Mark
Application: 1 Mark

Consider L.H.S

sin 49.tan 11.sec 41.tan 79

sin 49.sec 41.tan 11.tan 79

=sin 49.sec (9049).tan 11.tan (9011)

=sin 49.cosec 49.tan 11.cot 11

=sin 49.1sin 49.tan 11.1tan 11

=1

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