Question

cos 65 + theta minus sec 25 minus theta minus 1055 minus theta + cos 35 + theta​

Answer 1

cosec (65 + θ ) = sec (90 – (65 + θ )) = sec (25 – θ ) tan (55 – θ ) = cot (90 – (55 – θ ) = cot (35 + θ ) ⇒ sec (25 – θ ) – sec (25 – θ ) tan (55 – θ ) + tan (55 – θ ) = 0