Question

Prove :— sin(–theta ) = –sin( theta)
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Answer 1

Given that :- sin  (  −  θ )  =  −  sin  θ

As we know that, (  −  θ) means that the angle lies in the fourth quadrant,

For sine we can say that it is negative so it lies in fourth quadrant,

∴ sin  (  −  θ )  =  −  sin  θ

Hence proved