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i can't solve this trigo equ. :( ?

Quote: Originally Posted by afeasfaerw23231233 I used the identities and Now, the equation becomes (I used the formula ) Using the formula the equation becomes Let and the equation has the roots So you have to solve the equations and

Quote: Originally Posted by afeasfaerw23231233 i can't solve this trigo equ. :( ? Go back to line 1. Substitute and expand. Let . You end up with (but you better check): . Solve for t. Then solve for x.