Evaluate : `cos^2 (pi/4 + x) - sin^2 (pi/4 -x)`

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Evaluate : `cos^2 (pi/4 + x) - sin^2 (pi/4 -x)`
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ma'am thank to you very much
fully understood ma'am

lohit
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This question 's. Answer is wrong . Correct answer is zero(0) .

coddingstruggleplus
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Sorry sir, can I know why the symbol of the formula changed, like sin ( a + b), the symbol of + symbol should remain right? why do you change it into negative?

iqraizzzahari