PLANE TRIGONOMKTKY. S7 



406. Ivecluce to its simplest form 

 2a+ysin 2a-l) 



407. Prove that 





- 



(4) ? = tan- J + tan-' J + tan-i+Stan-'l+tan 



408. Prove that 

 sin 4a sin (y - (3) + sin 4)8 sin (a - y) + sin 4y sin (ff - a) 



409. Prove that 



TMC* n (5x - 4) . 



sin sin... sina; = aj--r * 



o 



He being taken n time*. 



U<>. If P be any point on the Nine Pointe* Circle of the 

 triangle ABC, 



in2-4 nin 2/? tin 2C). 



