Question

proof it sinsqare 70 +cos sqare 110 =1​

Answer 1

Answer:

sin²70+cos²110

sin²70+cos²(180-70)

sin²70+cos²70

we know that

sin²A+cos²A=1

so ,

sin²70+cos²70=1

prove that.....

Answer 2

Answer:sin²70+cos²110=

Sin²(90-20)+cos(90+20)

=cos²20+sin²20

=1