# Answer to Question #12901 in Trigonometry for klaudia

Question #12901

1. Use Demoivre Theorem. Express result in standard form.

(1+i)^7

2.verify:

a)cosx(tang^2x+1)=secx

b)(sinx) / (1-cosx) = (1+cosx) / (sinx)

3. Solve:

a)2sin^2x-sinx-1=0

b)tang^2x-1=0

c)cosx+sqrt(3) = -cosx

(1+i)^7

2.verify:

a)cosx(tang^2x+1)=secx

b)(sinx) / (1-cosx) = (1+cosx) / (sinx)

3. Solve:

a)2sin^2x-sinx-1=0

b)tang^2x-1=0

c)cosx+sqrt(3) = -cosx

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