Question

value of cosec ( 70°+ theta) - sec(20-theta) +tan(65°+theta)- cot (25°- theta)​

Answer 1

cosec(70+A) - sec(20-A) + tan(65+A) - cot(25-A)

70°=90°-20°

65°=90°-25°

cosec[(90-20)+A] - sec(20-A) + tan[(90-25)+A] - cot(25-A)

// cosec (90-A) = sec A

tan(90-A) = cot A

sec(20°-A) - sec(20°-A) + cot(25°-A) - cot(25°-A)

[ cancel the terms ]

= 0

Note: "A" is the theta...

Hope it helps..✌

Answer 2

Use complemently angle formala.