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If tan x= a/(a+1) and tan y=1/(2a+1), sh...

If `tan x= a/(a+1)` and `tan y=1/(2a+1)`, show that one of the values of :
`x+y= pi/4, a in R, a ne -1, a ne -1/2`.

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MODERN PUBLICATION-TRIGNOMETRY-EXERCISE
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  11. If sin alpha=15/17 and cos beta=12/13, find the values of : cos (alph...

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  12. If sin alpha=15/17 and cos beta=12/13, find the values of : tan (alph...

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  13. If cos (alpha+beta)=4/5, sin (alpha -beta)=5/13 and alpha, beta lie b...

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