Question

${ \cos(45?) }^{?2} - { \sin(?15) }^{2} = \frac{ \sqrt{3} }{4}$
Trigonometric sum of std 11th maths​

Answer 1

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Basic Trigonometric Formulas for Class 11

Basic Trigonometric Formulas for Class 11cos (A + B) = cos A cos B – sin A sin B.

Basic Trigonometric Formulas for Class 11cos (A + B) = cos A cos B – sin A sin B.cos (A – B) = cos A cos B + sin A sin B.

Basic Trigonometric Formulas for Class 11cos (A + B) = cos A cos B – sin A sin B.cos (A – B) = cos A cos B + sin A sin B.sin (A+B) = sin A cos B + cos A sin B.

Basic Trigonometric Formulas for Class 11cos (A + B) = cos A cos B – sin A sin B.cos (A – B) = cos A cos B + sin A sin B.sin (A+B) = sin A cos B + cos A sin B.sin (A -B) = sin A cos B – cos A sin B.

Answer 2

Answer:

{ \cos(45?) }^{?2} - { \sin(?13) }^{5} = \frac{ \sqrt{2} }{1}cos(95?)?2−sin(?55)2=33

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