Give an example, with justification:

A real life situation requiring the use of a trigonometry identity.

Knowledge is life, so open your doors of perception.

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- Aug 23rd 2008, 08:15 AMpuneettrigonometry
Give an example, with justification:

A real life situation requiring the use of a trigonometry identity.

Knowledge is life, so open your doors of perception. - Aug 23rd 2008, 09:33 AMTKHunny
Anything you want square. Measuring the sides will not get you there unless:

1) You can verify the corners are right angles, or

2) You can calculate and measure the diagonals. - Aug 23rd 2008, 09:35 AMskeeter
Here is one use of identities that is introduced to students in a high school physics class ... the derivation of the range formula for the horizontal displacement of a projectile (Galilean model).

start with the physics equation for vertical displacement ...

since the projectile lands at the same height it started,

...

solving for t ...

horizontal displacement is given by the formula ...

using the last two equations, eliminate the parameter t ...

**using the double angle identity**,

the last equation becomes ...

from this equation, it can be deduced that the launch angle for maximum horizontal range is 45 degrees.