#Trigonometric Identities Question

12 messages · Page 1 of 1 (latest)

graceful loom
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I'm stuck on part (b) of the question

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supple stoneBOT
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graceful loom
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pretty easy question but i just don't know how to approach

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my "solution"

primal hinge
# graceful loom

Notice the following:
tan(3π/8) = 1/cot(3π/8) = 1/tan(π/8)
So, A = π/8, then B = -π/8. So:
1/tan(π/8) = (1 - tan(-π/8))/(1 + tan(-π/8))
Flipping the expression and remembering that tan(x) is odd, we get:
tan(π/8) = (1 - tan(π/8))/(1 + tan(π/8))

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So, you can find it from there.

graceful loom
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ohhh

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yeah i see it

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thanks!

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+close