Trig Identities homework Ex 10D q5,6,7,11

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Year 12 AS Maths Homework on Trig Identites from the textbook Ex10D q2-13. This video goes through Q5, 6, 7 and 11 because you can use the same technique for all of them.
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Hi, 270<Theta<360, it should be 4th quadrant, there tan is -ve

nandeeswarareddy