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Question

Find the value of cos226+cos264sin255+sin235.
  1. 1

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Solution

The correct option is A 1
cos226+cos264sin255+sin235

sin(90θ) = cos(θ);
sin(90θ) = cos(θ)

=cos226+sin2(9064)cos2(9055)+sin235

=cos226+sin226cos235+sin235

By Trigonometric Identity,

[ sin2θ+cos2θ=1]

=11

=1


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