how to prove: tan 48degree tan 23degree tan 42degree tan 67degree=1
Answers
Answered by
1
tan(90-42) tan(23) tan(42) tan(90-23)
tan(90-x) = cot x
→ cot(42) tan(42) tan(23) cot(23)
tan(x) cot(x) =1
→ =1
tan(90-x) = cot x
→ cot(42) tan(42) tan(23) cot(23)
tan(x) cot(x) =1
→ =1
Mutahhir:
bt how do u know that tan(x) cot(x)= 1
cot(x) = 1/tan(x). that is cot is the resiprocal of tan
similarly, Cosec is the resiprocal of Sin and Sec is the resiprocal of Cos
thanks
now i understood
you are welcome!!
Similar questions