parmenides51 02.09.2023 11:34 It is known that $\frac{7}{13} + \sin \phi = \cos \phi$ for some real $\phi$. What is sin $2\phi$?
soryn 02.09.2023 14:26 Is 120/169 squaring,and using the fundamental formula of trigonometry and the formula of sine of double angle..
nils 02.09.2023 14:52 soryn wrote: Is 120/169 squaring,and using the fundamental formula of trigonometry and the formula of sine of double angle.. Yeah the answer is correct Thoughts Try to find $cos\phi sin\phi$ and use the double angle frmula