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October 21, 2014

October 21, 2014

Posted by **Amanda** on Thursday, April 19, 2012 at 9:20pm.

csc^2-2=0

all angles

4cos^2x-4cosx+1=0

all angles and name 8 angles

7sin^2x-22sinx+3=0

all angles and name 8 angles

2cos^2x-7cosx=-3

all angles

sinx(2sinx+1)=0

all angles

- Per-calc Helppppp -
**Reiny**, Thursday, April 19, 2012 at 10:42pm1. csc^2 x = 2

sin^2 x = 1/2

sin x = ±1/√2

x = π/4, 3π/4 , 5π/4 , 7π/4

2. 4cos^2x - 4cosx + 1 = 0

(2cos x - 1)^2 = 0

(2cosx - 1)= 0

cosx = 1/2

x = π/3 or x = 5π/3

3.

7sin^2 x - 22sinx + 3 = 0

(7sinx - 1)(sinx - 3) = 0

sinx = 1/7 or sinx = 3 , which is not possible

for sinx = 1/7

make sure calculator is set to radians

x = .1433 (in I) or x = π - .1433 = 2.998 ( in II)

do the rest the same way

- Per-calc Helppppp -
**Tulika**, Friday, April 20, 2012 at 12:55amyup

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