TRIGONOMETRIC RATIOS OF COMPOUND ANGLES
About "Trigonometric ratios of compound angles" Trigonometric ratios of compound angles : An angle made up of the algebraic sum of two or more angles is called a compound angle. Here, we are going see the formulas for trigonometric ratios of compound angles. sin (A + B ) = sinA cosB + cosA sinB sin (A - B ) = sinA cosB - cosA sinB cos (A + B ) = cosA cosB - sinA cosB cos (A - B ) = cosA cosB + sinA cosB tan (A + B ) = [tanA + tanB] / [1 - tanA tanB] tan (A - B ) = [tanA - tanB] / [1 + tanA tanB] Trigonometric ratio table From the above table, we can get the values of trigonometric ratios for standard angles such as 0 °, 30 °, 45 °, 60 °, 90 ° Now, let us look at some practice problems on " Trigonometric ratios of compound angles". Trigonometric ratios of compound angles - Practice problems Example 1 : Find the value of cos15 ° Solution :...
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