Question

(c) cos55° + cos35º = 12 cos10°​

Answer 1

Answer:

cos55°+cos35°=12cos10°

to prove

=>LHS=RHS

LHS

cos 55°+cos35°=0.5736+0.8192

=1.3928

LHS=1.3928

RHS

12cos10°=>cos10°=0.9848

12cos10°=12×(0.9848)

=11.8176

therefore;

LHS≠RHS