Step-by-step explanation:
note that
sin²x = (1-cos²x)
LHS= cos²x - 2 sin²x
= cos²x - 2(1-cos²x)
= cos²x - 2 + 2cos²x
= 3cos²x - 2
or
cos²x = (1-sin²x)
LHS= cos²x - 2 sin²x
=1-sin²x - 2 sin²x
= 1-3sin²x
Answer:
50
Step-by-step explanation:
Fifty lol Gosh why does my answer have to be 20 characters
Answer:
3/8
Step-by-step explanation:
1/4= 2/8
5/8-2/8=3/8
Here you go!! Hope it helps !!