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This is very important and frequently used in trig. Learn the proof of sin (a+b) = a cos b + b. To ask unlimited maths doubts download doubtnut from https//googl/9wzjcw using the formula of `sin(ab)=sinacosbcosasinb` find value sin`15^@`.
These are very important identities in the proof of derivative sine function. To derive formula (a +b). This is the solution of question from rd sharma book class 10 chapter trigonometric ratios also available in r s aggarwal 1.