Question

d) Ifcos7A=sin(A-6'), Where 7A is an acute angle, find the value ofA:
1) Express sin81° + tan 81° interms of trigonometric ratios of angles between 0⁰ and 45⁰​

Answer 1

Answer:

The value of A is 12degree

Step-by-step explanation:

(d) cos 7A=sin(A-6')

or, sin(90'-7A)=sin(A-6')

or, 90'-7A=A-6'

or, -7A-A=-6'-90'

or, -8A=-96'

or, A=96/8

or, A=12'

[ ' =degree]