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Question

The value of cos226+cos264sin255+sin235 is:

(find out, without using trignometric tables)


A

1

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B

-1

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C

0

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D

not defined

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Solution

The correct option is A

1


cos226+cos264sin255+sin235=cos226+sin2(9064)cos2(9055)+sin235=cos226+sin226cos235+sin235=11=1

[As sin2θ+cos2θ=1]


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