Answer :

Given, cos(40° + θ) - sin(50° - θ)


[cos(90° - θ) = sinθ ]


cos(90° - (50° - θ)) - sin(50° - θ)


sin(50° - θ) - sin(50° - θ)


= 0


Option C is the correct as the value of cos(40° + θ) - sin(50° - θ) is 0


Option A is incorrect, since it does not match the value


Option B is incorrect, since it does not match the value


Option D is incorrect, since it does not match the value

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