complex numbers trig identities (1 Viewer)

[cormglakes]

i know how to get a,b,c but how do you get d? for d, i got another answer using the same method i used for c but cant get the correct result.

 

[Qeru]

View attachment 30418
i know how to get a,b,c but how do you get d? i got another answer using the same method i used for c.

View attachment 30418
i know how to get a,b,c but how do you get d? for d, i got another answer using the same method i used for c but cant get the correct result.

Yeah its meant to be the reciprocal

 

[tickboom]

View attachment 30418
i know how to get a,b,c but how do you get d? for d, i got another answer using the same method i used for c but cant get the correct result.

I think there is a mistake in the question. I actually had someone send me this question last year. Here's a video where I work through it in case it helps:

 

[CM_Tutor]

@cormglakes, where is this question from?

 

[cormglakes]

@cormglakes, where is this question from?

mastering maths textbook

 

[stupid_girl]

Yeah its meant to be the reciprocal

In this case, it might be easier to think of it as "complementary". Changing theta in (c) to pi/2-theta gives the answer quickly.