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cos 225^(@)+ sin 165^(@)=...

` cos 225^(@)+ sin 165^(@)=`

A

0

B

`(sqrt(3)-1)/(sqrt(3))`

C

`(sqrt(3)-1)/(2sqrt(2))`

D

`(sqrt(2)+1)/(sqrt(2))`

Text Solution

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The correct Answer is:
A
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Knowledge Check

  • ( sin 70^(@) + cos 40^(@) )/( cos 70^(@) + sin 40^(@))=

    A
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    B
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  • sin 120^(@) cos 150^(@)- cos 240^(@) sin 330^(@) =

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    C
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    D
    `-(sqrt(3)+1)/(4)`

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