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# C3 Trig - why can't it be 360? Why only 0? watch

1. For part C, Watching an examsolutions video. Here's the question

I'm watching ExamSolutions go through part C and he says that the minimum was when cos(theta-73.74)=1, which I get. Then, he says that theta-73.74=0 (since inverse cos of 1 is 0. However, why is it 0? How come it isn't 360 either? Using 360 would give you a different answer completely, but cos(360) is 1 too.

Attachment 702294

2. (Original post by vector12)
For part C, Watching an examsolutions video. Here's the question

I'm watching ExamSolutions go through part C and he says that the minimum was when cos(theta-73.74)=1, which I get. Then, he says that theta-73.74=0 (since inverse cos of 1 is 0. However, why is it 0? How come it isn't 360 either? Using 360 would give you a different answer completely, but cos(360) is 1 too.

Yeah but then as the question specifies.
3. (Original post by vector12)
For part C, Watching an examsolutions video. Here's the question

I'm watching ExamSolutions go through part C and he says that the minimum was when cos(theta-73.74)=1, which I get. Then, he says that theta-73.74=0 (since inverse cos of 1 is 0. However, why is it 0? How come it isn't 360 either? Using 360 would give you a different answer completely, but cos(360) is 1 too.

can it be 360 with the restriction of theta given in the question?

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