A-Level Maths: E4-02 Trigonometry: Given sin(x) = 3/7, exact values of cosec(x), sec(x) & cot(x)

[TurboTech]

One of the most underrated channels i have come across

[helenday]

Fantastic lesson, with cleverly timed visual aids that really added to my understanding of another of those very complex advanced Maths topics.

[flawempire]

Really gotta thank you so much I had troubles learning trigonometry on the A syllabus

[AceOfHearts]

Hi Jack, the answer to this question is plus/minus root 5 over 5... i only agree with the negative sol. Is the book answer wrong?

Given cot P = -2. where π < P < 2π, calculate the exact value of sin P.

I only see minus root 5 over 5... not +... would highly appreciate your input.

[fraserglasgow]

is it necessary to graph the trig functions against eachother to check if they are positive or negative? 5:15

[medicusv]

Just wanted to ask, is cotx and secx always negative if obtuse for any value of x?

[suleimana]

Could you not just inverse sin of 3/7 to find x and then use that x value to find the other answers?

[victoria]

So if it’s obtuse, cos and tan became negative?