Question

Sin ² 67 +sin²23=cos²89+cos²1=1

Answer 1

Answer:

sinsquare67+sinsquare23(change sinsquare67 to cossquare23)

cossquare23 +sinsquare23( we know that sinsquarethita+cossquarethitaa =1 )

so it is equal to 1

similarly 2nd one is also equal to 3rd one