Question

Find the value of cos 75
Solve. x²+x+1=0.
Solve. 3x -7 > 5x-1.​

Answer 1

Step-by-step explanation:

cos 75=cos (45 + 30)

cos 45.cos 30 -sin45 .sin30

1/√2.√3/2 -1/√2.1/2

√3/2√2 -1/2√2

√3-1/2√2

Answer 2

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