Trigonometry- exact value of sin2(-5pie/6)-2cos(120degrees)tan(7pie/4)

| August 30, 2017

Question
exact value of

sin2(-5pie/6)-2cos(120degrees)tan(7pie/4)

sin feta= 0.3 and cos feta= 0.5, what is the value of tan feta?

Solve: between 0 to pie

2square root 2 sin feta cos feta -2sin feta -square root 6 cos feta+square root 3=0

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