Question

i)show that sin 35° cos55° + sin55° cos35° = 1

ii)express in terms of angle between 0° and 45° cos81°+cot 81°​

Answer 1

Answer:

mujhe to ye chapter hi samajh nahi aaya

Answer 2

Answer:

ok hi lets start the question now  

in the first question it is given

that sin35cos55  

as we know complementary angles   that is

Sin(A)=cos(90-A)

value of A is 35  so we get it as

cos^2 55

this is added to sin 55 cos 35  

using the same logic above we get sin ^2 55

so we should now add

cos^2 55 +sin^2 55

now we use the first trigonometric identity

that is

(sin^2 A +Cos^2 A)=1

so the value of A is 55  in our case so we get the answer as 1

now moving on to the  second question  

express the terms between angles of 0 to 45 degrees

so by using complementary angles we can write

cos 81   as    Sin9

also we can write

cot 81 as tan 9

so we get the answer as sin 9+tan 9

hope it helps you