1 356-3 
8:. rFXM/=(4*** = ) p / ><Mr =T ><FP/ - 
82. cEQ_rr (xy~) cdp =^cd = dm xclm. 
83. AN = = 
84. RPf — nn — TPg. 
85. RT T — ^ 
86 . RT/=^ 
71 n 
x«='i=^x// = ) at«. 
m m x x 
— ( tnz x X — := ) CTP = r TF.. 
m c m tn m 
a. NT n .— ( C - x ff & m m ~ ) J ~~ — “ — PT /* 
88. PN X CB — <X>X — ~7 ; C — ) AN X CQ,. 
89. CAV — X> = )CTXPD. 
90. pr h = (7^-) fr: “ 
Hence f h is perpendicular to fp. 
. Mf _fA x /’'-)^'xM=-x(:c =— x ct ^ 
9 1 . ™/^ 7 X 7 " J » // *■* 
92. AMa=(nv/-^ = ) CC x f -£x ™ 
"CB 1 -f X CQ rr CB +F M y- 
? r 
