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What will be the formulae of trigonometric function Sin square (a+b)

Joy , 6 Years ago
Grade 11
anser 1 Answers
Arun

Last Activity: 6 Years ago

Dear student
 
sin² (a+b) = (sina cosb + cosa sinb)²
 
 = sin²a cos²b + cos²a sin²b + 2 sina sinb cosa cosb
= sin²a - sin²a sin²b + sin²b - sin²a sin²b + 2 sina sinb cosa cosb
 = sin²a + sin²b - 2 sin²a sin²b + 2 sina sinb cos a cosb

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