SOLUTION: 13. Find the exact value of sin 30 � - sin 45 � cos 45 � . a. 0 b. 1/2 c. 1 d. 2 14. Find the value of tan 42 � to 4 decimal places. a. 2.2914 b. 0.9004 c. 1.11

Question 57558:
13. Find the exact value of sin 30 � - sin 45 � cos 45 � .
a. 0
b. 1/2
c. 1
d. 2

14. Find the value of tan 42 � to 4 decimal places.
a. 2.2914
b. 0.9004
c. 1.1106
d. 0.7431

15. Find the value of sec 38 � to 4 decimal places.
a. 1.6243
b. 0.7880
c. 0.6157
d. 1.2690

Answer by funmath(2933) (Show Source): You can put this solution on YOUR website!

13. Find the exact value of sin 30 � - sin 45 � cos 45 � .
. 0
b. 1/2
c. 1
d. 2
Here's how:
sin(30)=1/2, sin(45)=, cos(45)=, therefore,

14. Find the value of tan 42 � to 4 decimal places.
a. 2.2914
. 0.9004 Make sure you calculator is on degree mode.
c. 1.1106
d. 0.7431

15. Find the value of sec 38 � to 4 decimal places.
a. 1.6243
b. 0.7880
c. 0.6157
. 1.2690
sec(x)=1/cos(x), so if you have a ti-83 type in (cos(38)) and it will give you the reciprocal of cos(38) which is sec(38).
Happy Calculating!!!

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