use half angle identities to find the exact value.

given: cos theta = -2/5 and theta lies in quadrant II, find tan theta/2.

Question

use half angle identities to find the exact value.

given: cos theta = -2/5 and theta lies in quadrant II, find tan theta/2.

anonymous · Answer

Do you know the quad rule of what should be negative or positive?

cookiimonster627 · Answer

no, im not sure

anonymous · Answer

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cookiimonster627 · Answer

its going to be negative?

anonymous · Answer

Quad 1: Everything is positive
Quad 2: Only sin/csc are postive
Quad 3: Only tan/cotan are positive
Quad 4: Only cos and sec are positive

cookiimonster627 · Answer

o only cot and tan would be positive

anonymous · Answer

Sin = O/H
Cos = A/H
Tan O/A

Draw a triangle given that cos = -2/5 in quad 3

anonymous · Answer

The Quad rule can be remembered via (All students take calclus)

The trig functions as: (Oscar-has a-hairy old-as-..er, arm)

cookiimonster627 · Answer

oh okay

anonymous · Answer

Use cos to find tan, and make sure tan is positive.  Can you do that?

cookiimonster627 · Answer

i dont think so, could you do it with me step by step

cookiimonster627 · Answer

@TheSmartOne  could you help me. this is my last problem then im done