Ask Experts Questions for FREE Help !
Ask
    mwilt's Avatar
    mwilt Posts: 3, Reputation: 1
    New Member
    		  
    #1

    Mar 4, 2009, 08:59 PM
    trig proofs
    how do you prove

    cosx+sinxtanx=secx
    Perito's Avatar
    Perito Posts: 3,139, Reputation: 150
    Ultra Member
    		  
    #2

    Mar 5, 2009, 05:55 AM

    The usual way to prove any of these trig identities is to convert everything to sines and cosines and simplify. Sometimes you have to be cleaver.

    cos(x) + sin(x) tan(x) = sec(x)

    identity: tan(x) = sin(x) / cos(x)

    cos(x) + sin(x) * sin(x)/cos(x) = 1/cos(x)
    cos(x) + sin^2(x)/cos(x) = 1/cos(x)
    [cos^2(x) + sin^2(x)] / cos(x) = 1 / cos(x)

    identity: sin^2(x) + cos^2(x) = 1

    identity: sec(x) = 1/cos(x)

    sec(x) = sec(x)

    quod erat demonstrandum
Not your question? Ask your question View similar questions
 

Question Tools Search this Question
Search this Question:

Advanced Search


Check out some similar questions!

Algebraic Proofs [ 3 Answers ]

how do I do this? Fill in the missing information in this Algebraic proof. Two lines intersect. Angle 1 equals ( 3x + 20) . Angle 2 = (5x - 16) , Angles 1 and 3 are vertical angles. The measure of angle 1 = the measure of angle 3. (Vertical Angles are Congruent) a.) _____ = (5x - 16)...

Trigonometry proofs [ 4 Answers ]

how do you prove that tanx+coty / tanxcoty = tany+cotx

Pre cal proofs [ 2 Answers ]

can someone please help me slove these 4 questionss? 1) Sin/ Csc + Cos/ Sec =1 2) sin^2/Sec^2-1 = Cos^2

Precal proofs [ 1 Answers ]

can someone please help me slove these 4 questionss? 1) Sin/ Csc + Cos/ Sec =1 2) sin^2/Sec^2-1 = Cos^2

Verifying Trig Proofs [ 1 Answers ]

Csc X - Sin X= (cot X)(cos) Solve Please Show Me Step By Step

View more questions Search