Question

Prove: sin^2 20+ sin^2 70- tan^2 45=1 ​

Answer 1

Answer:

Step-by-step explanation:

= sin^2 20*+sin^2 70* x tan^2 45*

= sin^2 20*+cos^2 20* x tan^2 45*

= 1 x tan 45* ------[because sin^2+cos^2=1]

= 1                 ------[tan 45*=1]

= R.H.S