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Krista King
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Krista King

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How do you sketch polar curves? This is how! HINT: This one's a rose!﻿
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Krista King

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I'm kicking off the week the right way with some more trig identities. Today it's all about product to sum identities. Enjoy!﻿
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Don't forget to consider the endpoints of the interval!﻿
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Finding the value of a trig function is always going to be about getting the function in terms of sine and cosine first, instead of any of the other four functions.﻿
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This is a fun little application of trig that lets you figure out how tall something is.﻿
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Even-odd identities follow the same format for each trig function, so once you know one of them, you know them all!﻿
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Have them in circles
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Krista King

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I've been all about trig identities lately, and here's another kind: sum to product identities, which let you turn the sum or difference of trig functions into the product of trig functions.﻿
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These problems are all about manipulating values with trig identities, and showing that the right-hand side is equal to the left-hand side.﻿
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This is a really common problem you'll get asked in Trigonometry class, so here are a couple examples of how to prove that a trig equation is true.﻿
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Sum-difference identities come in really handy whenever you're trying to find the trig function of an angle greater than 360 degrees or 2pi radians.﻿
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Not 1, not 2, but ALL SIX trig functions!﻿
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