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sin(270-theta)= -cos theta

Archith Sudheendra , 10 Years ago
Grade 10
anser 5 Answers
Aadit Desai

Last Activity: 10 Years ago

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. 

grenade

Last Activity: 10 Years ago

what we have to do then

Aadit Desai

Last Activity: 10 Years ago

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

grenade

Last Activity: 10 Years ago

aadit how do u know what to do

Aadit Desai

Last Activity: 10 Years ago

Because i have alredy studied it in class 11.
 

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