Question

pls help me to solve:------- prove that :- 1)sin10°sin50°+sin50°sin250°+sin250°sin10°=(-- 3/4). & 2)If cos a=n cos (a+2b) ;then prove (n+1)tan(a+b)=(n-1)cot b

Answer 1

Hey mate here is ur answer *"*****
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Hope it will help u@###