write any 10 trigonometric formulae
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Sin (a+b)=sin a cosb+ cos a sin b
Sin (a-b)=sin a cos b - cos a sin b
Cos(a+b)=cosa cosb - sina sinb
Cos(a-b)=cosacosb+sina sin b
Tan (a+b)=tana - tanb \1-tana tanb
Tan (a-b) = tana-tanb\1+tana tanb
Cot(a+b)=cota cotb-1\cotb+cot a
Cot(a-b)=cota cotb+1\cotb-cot a
Sin2a=2sina cos a
Cos 2a=2cos^2a-1
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