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Question Number 86614 by mathocean1 last updated on 29/Mar/20

A B C i s a n i s o c e l t r i a n g l e s u c h a s

A B = A C = 3 a n d B C = 4

α, β, a n d γ a r e i t s a n g l e s .

S h o w t h a t c o s (\frac{α + β}{2}) = s i n (\frac{γ}{2})

H i s i r s \dots

Answered by TANMAY PANACEA. last updated on 29/Mar/20

\frac{α + β}{2}

= \frac{π - γ}{2}

= \frac{π}{2} - \frac{γ}{2}

c o s (\frac{α + β}{2})

= c o s (\frac{π}{2} - \frac{γ}{2})

= s i n \frac{γ}{2}

Commented by mathocean1 last updated on 29/Mar/20

t h a n k y o u s i r .