Question 30138
For part a; to do this first switch your calculator into radians mode and then calculate:
sin(30)+cos(30)(cos[30]/sin[30])=1/sin(30)
-0.988+(0.154)(-0.156)=1.01
1.01=1.01


For part b put the equation into simplier steps:
{{{SinA+CosA(CosA/SinA)=1/SinA}}} --> deal with the left side:
{{{SinA+(Cos^2(A))/SinA}}}
Multiply the SinA by SinA to get a common denomenator:
{{{(Sin^2(A)+cos^2(A))/SinA}}}
Use Pathagorean identity:
{{{1/SinA}}}
L.S. = R.S and Hence, proven:
Paul.