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#1 Help Me ! » Trig » 2008-01-05 14:10:23

isodel
Replies: 2

I just CAN'T figure this question out!

From a lookout spot 50 m above sea level on a boat, the captain spots two ships. The angle of depression to the ship due west is 40 degrees. The other ship spotted S 70 w will be seen at an angle of depression of 34 degrees. How far apart are the two ships?

#2 Help Me ! » Proving identities » 2008-01-04 07:00:41

isodel
Replies: 1

I really need help with this, I just can't figure this out.

1. (cosx - sinx)² = 1- 2sinxcosx

2. cosx^4 - sinx^4 = cosx² - sinx²

3. 1/secx + tanx = secx - tanx

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