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Question

Calculate the value of A (A is acute angle),in degrees if
(tanA1)(cosec3A1)=0
What is the smaller value of the angle A (in degrees)?

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Solution

(tanA1)(cosec3A1)=0
Either tanA1=0 or cosec3A1=0
Either tanA=1 or cosec3A=1
tanA=tan45 or 3A=90
A=45 or A=30
Thus the smaller value of A in degrees is 30

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