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Assertion (A) : In a right angle triangle $ABC$, $\angle B = 90^\circ$. Therefore the value of $\cos (A + C)$ is equal to $0$.
Reason (R) : $A + B + C = 180^\circ$ and $\cos 90^\circ = 0$.
Reason (R) : $A + B + C = 180^\circ$ and $\cos 90^\circ = 0$.
- (a)Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
- (b)Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
- (c)Assertion (A) is true, but Reason (R) is false.
- (d)Assertion (A) is false, but Reason (R) is true.
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Ans: (A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).