For the first 1 draw the triangle(to understand) and then use your calculator
and for the second
2cos^3(x)+5cos^2(x)=2-cos(x)
--> 2cos^3(x)+5cos^2(x)+cos(x)-2=0
factorize and then solve for x...
hi guys im having a bit of trouble with this 2 questions from my text book.
1. Find the exact value of the expression:
cos(arctan3/4)+tan(arccos3/5)
2. Solve the trig Eq:
2cos^3(x)+5cos^2(x)=2-cos(x)
can you guy please post a worked solution if you can im out of ideas.
thanks