Question

how is
$\binom{1} { \cos \: {theta}} {2} = ( sec \: theta) {2}$
NO SPAMMING.ONLY CORRECT ANSWER​

Answer 1

refer to the image for solution hope it will help you

Answer 2

Step-by-step explanation:

$( \frac{1}{ \cos \: a \: } ) ^{2} = ( \sec \: a )^{2} \\ lhs \: = ( \frac{1}{ \cos \: a \: } ) ^{2} \\ = \frac{1}{ \cos \:^{2}a } \\ we \: know \: that \: \: \: \: \: \: \frac{1}{ \cos \: a} \: = \sec \: a \\ lhs \: = \: \sec^{2} a \\ now \: \\ rhs \: = ( \sec \: a )^{2} \\ = \sec{}^{2}a \: \\ \\ \: lhs \: = \: rhs \: \\ hence \: proved \: \\ \: i \: hope \: it \: may \: help \: you \: \\ note \: \: => \: i \: have \: taken \: thetha \: as \: a \:$