Question

Given that sin (a +

b.= sin a cos b + cos a sin b find the value of sin 75°

Answer 1

hello you can write sin 75    

as sin(45+30)=sin45cos30+cos45sin30

=1/√2 × √3/2 +  1/√2 ×1/2

take 2√2 as lcm

=$\frac{\sqrt{3}+1 }{2\sqrt{2} }$

hope it help

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