𝐒𝐨𝐥𝐯𝐞 𝐓𝐫𝐢𝐠𝐨𝐧𝐨𝐦𝐞𝐭𝐫𝐢𝐜 𝐄𝐪𝐮𝐚𝐭𝐢𝐨𝐧𝐬 𝐮𝐬𝐢𝐧𝐠 𝐈𝐝𝐞𝐧𝐭𝐢𝐭𝐢𝐞𝐬

𝐒𝐨𝐥𝐯𝐞 𝐓𝐫𝐢𝐠𝐨𝐧𝐨𝐦𝐞𝐭𝐫𝐢𝐜 𝐄𝐪𝐮𝐚𝐭𝐢𝐨𝐧𝐬 𝐮𝐬𝐢𝐧𝐠 𝐈𝐝𝐞𝐧𝐭𝐢𝐭𝐢𝐞𝐬 `\sin^{2}x+\cos^{2}x=1,\ \cos\left(x\right)=\sqrt{1-\sin^{2}\left(x\right)}` `\sin\left(2x\right)=2\sin x\ \cos x` `\cos\left(2x\right)=\sqrt{1-\sin^{2}\left(2x\right)}` `\cos\left(2x\right)=\cos^{2}x-\sin^{2}x\ =\ 2\cos^{2}x-1\ =\ 1-2\sin^{2}x` `\tan\left(x\right)\ =\ \frac{\sin x}{\cos x}`

By @SatvinderEdtech Singh