Find exact values for sin 20 cos 10+ cos 20 sin 10 and cos 70 cos 20 - sin 70 sin 20

Without scientific calculator | how to find the value of sin41| trigonometry | by ankit sir

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sin20°sin40°sin60°sin80°=3/16

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The value of `sin10^@+sin20^@+sin30^@...+sin360^@` is equal to -

sin `20^(@) ` sin `40^(@)` sin `60^(@)` sin `80^(@) =(3)/(16)`

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The value of (sin 20^(@)cos70^(@)+ cos20^(@)sin70^(@))/(sin23^(@)cosec23^(@)+cos23^(@)sec23^(@))...

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