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November 01, 2025, 04:59:20 pm
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Author Topic: Tips  (Read 628 times)  Share 

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asdfqwerty

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Tips
« on: April 20, 2014, 10:52:04 am »
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does anyone have any tips to remember the complementary properties:
eg. tan (pi/2 - a) = cot (a) ?

thank you
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keltingmeith

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Re: Tips
« Reply #1 on: April 20, 2014, 12:05:04 pm »
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I like to think of it in terms of graphs.

For example, if you take y = sin(x) and move it over pi/2 to the right, what do you get? The graph for y = -cos(x). So, sin(x - pi/2) = -cos(x)
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lzxnl

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Re: Tips
« Reply #2 on: April 20, 2014, 06:21:39 pm »
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Quote from: asdfqwerty on April 20, 2014, 10:52:04 am
does anyone have any tips to remember the complementary properties:
eg. tan (pi/2 - a) = cot (a) ?

thank you

cotangent = complementary tangent
i.e. cot is tangent of complementary angle
complementary angle + angle = 90 degrees

same with sines and secants
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