Maths F4- sin / cos

👨🏻‍🏫 學術台數學

2007-09-10 6:22 am

Given 0<=A<=180, how many roots does the equation (sinA+1) x (tanA+3)=0 have?
Many Thanks

回答 (1)

2007-09-10 6:30 am

✔ 最佳答案

(sinA+1) (tanA+3)=0
sinA=-1 or tanA=-3

Since to when 0<A<180 , sin is + and tan have one -

so have just 1 ans
=108.4349488

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