exam Maths Puzzle Numerical Ability

Hi Can I have some help with the following problem?

Biologists have observed that the chirping rate of crickets of a certain species is related to temperature, and the relations

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I need help solving this problem:

6y+1<39 Find the solutions of the equation that are in the interval [0,2π). Please show steps (especially rearranging the equation to solve it. Thanks for helping me. I know the solution is 7pi/6, 11pi/6, pi/2.

sinb+2cos^(2)b=1