Question

cos² theta(1+tan²theta)=1​

Answer 1

$\tt\colorbox{pink}{Refer \: the \: attachment}$

Hence proved ✔️

Answer 2

Step-by-step explanation:

cos²theta ( 1+tan²theta)= 1

cos²theta ( 1+tan²theta)= 1

cos²theta × sec²theta= 1

squaring on both sides,

we get

cos theta × sec theta = 1

1= 1

LHS = RHS

Hope u understand