Answered

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

Sagot :

Pulkit
secd(38)
= 1/cosd(38)
= 1/sqrt[1-sind^2(38)] because cos^2(x) + sin^2(x) = 1
cos(30) = sqrt(3)/2 = 0.8660
cos(45) = 0.707
so cos(38) can be assumed to some where around 0.8
= 1/0.8
= 1.25

Therefore D is correct answer
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