cos sin(90°-theta) + sin cos(90°- theta) = 1
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Costheta × sin(90°-theta) + sintheta × cos(90°-theta)
= costheta × costheta + sintheta × sintheta
= costheta² + sintheta²
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= costheta × costheta + sintheta × sintheta
= costheta² + sintheta²
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cos2theta+ sin2theta = 1
I hope this the answer
I hope this the answer
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