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AS-Level Trigonometry

2cosx-sinx=0
What are the two values of x?
Original post by Joshyboyyo
2cosx-sinx=0
What are the two values of x?

You need to get it in terms of one trig function. You only know one relevant identity, so guess which function it should be.
2cosx-sinx=0
2cosx=sinx
2=sinx/cosx
2=tanx

tan^-1 (2) and solve for the range given. Haven't got a calculator on hand.

Original post by Boro12345


You're not supposed to give full solutions.

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