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# rewrite the trig expression. assume u>0 and the value of the inner inverse trig expression; 0<theta<π/2

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rewrite the trig expression. assume u>0 and the value of the inner inverse trig expression; 0<theta<π/2

cos(tan-1 u)

Guest Jul 31, 2014

### Best Answer

#2
+92206
+13

I always like to draw a triangle to answer these.

Melody  Aug 1, 2014
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### 4+0 Answers

#1
+85699
+8

We want to find the cosine of a first quadrant angle whose tangent = u.....  (or, u/1)

So we have....

cosΘ = 1/ √(1 + u2)

CPhill  Aug 1, 2014
#2
+92206
+13
Best Answer

I always like to draw a triangle to answer these.

Melody  Aug 1, 2014
#3
+8256
0

Nice triangle Melody! I like your answer.

Can somebody explain me this problem?

DragonSlayer554  Aug 1, 2014
#4
+92206
0

No you will have to wait a few more years!  I think that you already knew that.

Will you please stop your excessive posting!

Melody  Aug 2, 2014

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