cos(A-30*)=3cos(A+30*) how to do???i stuck at beginning. THX FOR WHO HELP~
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Originally Posted by sanikui cos(A-30*)=3cos(A+30*) how to do???i stuck at beginning. THX FOR WHO HELP~ Do you know these formulae: Now apply these formulae and see here, cos (A - 30) = 3 cos (A + 30)
Originally Posted by Shyam Do you know these formulae: Now apply these formulae and see here, cos (A - 30) = 3 cos (A + 30) Yes, the answer is right. But the answer got 2 angles. Becouse tangent positive in 1st and 3rd quadrant. A=41* and 221* thx thx V^^
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