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if @ and $ are the acute angles such that sin@=1/2 and cos$=1/3 then @+$ lies in the interval?


6 years ago


Answers : (1)


sin@=1/2 => cos@=31/2

cos$=1/3 =>sin$=(2*21/2)/3


the value of 61/2=0.573 and cos (pie/3)=31/2/2=0.868 and cos (2pie/3)=0.5

since value of cos(@+$)lies bettween cos(pie/3) and cos(2pie/3)

thus @+$ lies bettween [pie/3,2pie/3]

6 years ago

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