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TanA - secA = 1. sinA-1/cosA 2. sin^2A-cosA 3. cos^2A-1/cosA Please explain, don’t bother answering if you’re not going to explain. Ty!
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4 votes
TanA - secA =

1. sinA-1/cosA
2. sin^2A-cosA
3. cos^2A-1/cosA

Please explain, don’t bother answering if you’re not going to explain. Ty!

User Sanjay Prajapati
by
7.3k points

1 Answer

3 votes

Answer:

The answer is 2. sin2A-cosA. This can be seen by using the trigonometric identities sin2A=2sinAcosA and cos2A=cos2A-sin2A. The expression tanA-secA can then be simplified to sinA/cosA-1/cosA, which can be further simplified to (2sinAcosA-cos2A)/cosA, which can be further simplified to 2sinAcosA-cosA, which can finally be simplified to sin2A-cosA.

User Djenny
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6.6k points
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