find, for 0=<A=<360 (A:tan^(3A)=tanA) i stuck at tan^3 and tanA. find 6tan^2(A)-4sin^2(A)=1 , 0=<A=<360 i stuck at 6tan^2(A).
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Originally Posted by sanikui find, for 0=<A=<360 (A:tan^(3A)=tanA) i stuck at tan^3 and tanA. [snip] . Case 1: . Case 2: . Case 2 (a): . Case 2 (b): . Solve each case over the given domain.
Originally Posted by sanikui [snip] find 6tan^2(A)-4sin^2(A)=1 , 0=<A=<360 i stuck at 6tan^2(A). One possible approach (there are many others): Substitute and . Re-arrange and simplify: . Therefore you need to solve over the given domain (the other case has no real solutions - why?)
question 1, i know do liaw....thx ~!
O.o For question 2, i know the answer A is 30*, 150*, 210*, 330*. But the problem is didnt how to do. Thx for helping~!V^^
Originally Posted by mr fantastic One possible approach (there are many others): Substitute and . Re-arrange and simplify: . Therefore you need to solve over the given domain (the other case has no real solutions - why?) I made several careless errors. Here is the corrected reply: Re-arrange and simplify: . Therefore you need to solve over the given domain (the other case has no real solutions - why?)
cos^2(A)=3/4 this undefined.
Originally Posted by sanikui cos^2(A)=3/4 this undefined. No. It IS defined.
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