Wednesday
September 17, 2014

Homework Help: Trig

Posted by Kasey on Thursday, January 29, 2009 at 9:12pm.

Can someone check my answers so far?

1. Find the exact value of tan(-3)

Answer: tan(-3) = tan (-3 + 2) = tan (-) = tan (- + 2) = tan() = sin ()/cos() = (0)/(-1) = 0

Exact value is 0


2. Solve triangleABC is C = 90 degrees, B = 20 degrees, and b = 10. Round the measures of sides to the nearest tenth and measure angles to the nearest degree.

Work:
(sinA)/a = (sinB)/b = (sinC)/c

(sin90)/c = (sin20)/10 = 1/c = 0.34/10

A+20+90=180 A = 180-110=70

(sinA)/9 = (sinB)/b

(sin70)/9 = (sin20)/10

0.93/9 = 0/34/10

0.93 * 0.034 = a = 27.35 -> 27.4

Answer is:
A= 70, B= 20, C=90
a=27.4 b=10, c=29.4


3. Find the exact value of sin405degrees

Work:
sin405=sin45=+0.70711
405-360

Answer is 45

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