Question

the value of Tan² alpha-1/cos²alpha​

Answer 1

Answer:

$\star \: \dfrac{tan \: ^{2} \alpha - 1 }{cos \: ^{2} \alpha } = \dfrac{ \dfrac{ \: \: sin ^{2} \alpha }{cos {}^{2} \alpha } \: - 1 }{ {cos}^{2} \alpha }$

$\star \dfrac{ \: \: \dfrac{ {sin}^{2} \alpha - {cos}^{2} \alpha }{ {cos}^{2} \alpha } \: \: }{ {cos}^{2} \alpha } = \footnotesize{sin}^{2} \alpha - {cos}^{2} \alpha$

$\star \: 1 - {cos \: }^{2} \alpha - {cos \: }^{2} \alpha \\ = 1 - 2 \: {cos \: }^{2} \alpha$

hope it helps.......

Answer 2

Answer:

ᴘʟᴢ ᴀɴsᴡᴇʀ ᴍʏ ǫᴜᴇsᴛɪᴏɴ