sin²5°+sin²10°+....+sin²85°+cos²45°
Answers
Answered by
3
hi,
here. ^ means square
sin^5+sin^10+.....+sin^40+sin^45+sin^50+.....sin^80+sin^85+cos^45
since cos^B+sin^B=1, and sinA=cos(90-A)
=sin^5+sin^10+.....+sin^40+cos^40+cos^35+...+cos^10+cos^5+1
=1×(40/5)+1
=9=Ans.
here. ^ means square
sin^5+sin^10+.....+sin^40+sin^45+sin^50+.....sin^80+sin^85+cos^45
since cos^B+sin^B=1, and sinA=cos(90-A)
=sin^5+sin^10+.....+sin^40+cos^40+cos^35+...+cos^10+cos^5+1
=1×(40/5)+1
=9=Ans.
SanyamTaneja:
If ant doubt, u can contact me and if u like my answer please braonliest it
any*
Similar questions