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sin(270-theta)= -cos theta sin(270-theta)= -cos theta
sin(270-theta) = -cos theta is right. Because in in unit circle 270-theta means u will in third qua. & in third qua. sin function is negative.
what we have to do then
As u know at the Y-axis function will change. So here sin function will convert in to cos function. Sin function is -ve int 3rd qua. so cos function will become -ve. Like, I have sin(240) = sin(270-30) = -cos30
aadit how do u know what to do
Because i have alredy studied it in class 11.
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