Question

prove that cos²theta + (1+tan²theta)=1​

Answer 1

Answer:

to prove

cos^2 theta (1+tan^2theta)=1

LHS,

cos^2 theta (1+ tan^2 theta)

=> cos^2theta + tan^2theta ×sin^2theta

=> cos^2thet + sin2 theta/ cos^2theta × cos^2theta

=> 1

hence, LHS = RHS

1=1