How is the five-six inductive formula of compulsory four in senior one derived? - Training Enrollment Network

How is the five-six inductive formula of compulsory four in senior one derived?

The fifth inductive formula is a direct conclusion through observation and experiment.

You can push six with five:

sin(pai/2+a)= sin((pai/2)-(-a))= cos(-a)= cosa

cos(pai/2+a)= cos((pai/2)-(-a))= sin(-a)=-Sina

I hope they can be adopted one by one.

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