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January 31, 2015

January 31, 2015

Posted by **TP** on Thursday, February 19, 2009 at 1:21am.

Can someone please tell me if proving this is possible at all? (But don't tell me how to solve it)

- Maths - Trig -
**Damon**, Thursday, February 19, 2009 at 4:30amsin x/cos x + cos x/sin x =

(sin^2 x + cos^2 x)/(sin x cos x )=

1/(sin x cos x)

I do not see how that comes out to 2 cosec x

- Maths - Trig -
**Reiny**, Thursday, February 19, 2009 at 9:30amUsually my first step in proving any trig identity is taking an arbitrary angle to see if it makes it true, say 45 degrees.

Picking up from Damon's first line, your equation is

tanx + cotx = 2/sinx

for x = 45 degrees

LS = 1+1 = 2

RS = 2/.707 which is not LS

so the equation is not an identity.

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