Question

Sin square 60 + cos square( 3x-9)= 1

Answer 1

Sin^2 60 + cos^2 ( 3x-9)= 1

=>Sin^2 60 + cos^2 ( 3x-9) = (Sin^2 60 + Cos^2 60)

( because we know Sin^2@ + Cos^2@ = 1)

=> cos ( 3x-9) = Cos 60

=> (3x-9) = 60

=> x = 69/3

=> x = 23

the value of x is 23