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# Trigonometric identities Watch

1. hii how do you solve (sinθ-1)(5cosθ + 3) = 0
interval 0<
θ
≤360
2. (Original post by prodigyhere)
hii how do you solve (sinθ-1)(5cosθ + 3) = 0
interval 0<
θ
≤360
How would you solve (x-1)(5y+3) = 0?
3. You need to think of this question as a quadratic. You should know that when (X-1)(5X+3)=0 that one of the equations within the brackets are equal to zero, this is because any number multiplied by 0=0. Try it on your calculator if you wish to do so...

So you set either (X-1)=0 or (5X+3)=0
Do you know what to do next?
4. actually you do not need any identities for this question...

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