SOLUTION: Will someone please help me, I'm so confused! If we extablish an identity, (in simplest terms) 4 sec^2 A - 7 tan^2 A would equal what? 1. (4 cos^2 A

SOLUTION: Will someone please help me, I'm so confused! If we extablish an identity, (in simplest terms) 4 sec^2 A - 7 tan^2 A would equal what? 1. (4 cos^2 A - 3 sin^2 A)/(cos^2 A) 2. 4

Question 150253: Will someone please help me, I'm so confused!
If we extablish an identity, (in simplest terms) 4 sec^2 A - 7 tan^2 A would equal what?
1. (4 cos^2 A - 3 sin^2 A)/(cos^2 A)
2. 4 - 3 tan^2 A
3. 1
4. (7 - 3 cos^2 A)/(cos^2 A)
Thank you so much for your time and help, Natalie!
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Remember your trig definitions,

Substitute

Remember also,

Substitute

Again,

Substitute again,

This matches answer 1.
But that's not really in simplest terms,

RELATED QUESTIONS
Please help me with the following problem: If we extablish an identity: (cos^2 A)/(1 +... (answered by jim_thompson5910,stanbon)

If we extablish an identity, sinAcscA-sin^2*A could equal which of the following... (answered by jojo14344)

Prove that the equation is an identity: (tan^2 B + 1)/ tanB + cotB = tanB Please (answered by Alan3354,jim_thompson5910)

Please help me tan(3x)+1={square root(2)}sec(3x) so far i have tried:... (answered by kev82)

Please help, I am so confused. The question reads: complete the identity... (answered by Edwin McCravy)

Please I need help!! Does this verify as an identity???? How would you solve this?? (answered by MathLover1,Theo)

Please help me solve this problem! If we establish an identity, -sin A csc A - sin^2 A - (answered by jojo14344)

Can someone please help me find the exact value of trig functions? (no calculator) I'm... (answered by lwsshak3,Alan3354)

if tan A= √2 -1 so solve sin A.cos A = √2/4 ANSWER Two things before we... (answered by Elomeht)