Question

..... plz solve it..7.(i)

Answer 1

sin65 = sin(90 - 25) = cos25

cos32 = cos(90 - 58) = sin32

sec62 = 1/cos62 but cos62 = cos(90 - 28) = sin28

⇒ sec62 = 1/sin28

substituting the above values in 7th question

we get 1 + 1 - 1 + cosec²30

we know that cosec30 = 2

the answer for the question is 2 - 1 + 4 = 5