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यदि tan theta = 1 और sin phi = (1)/(sqrt...

यदि `tan theta = 1` और `sin phi = (1)/(sqrt(2))` हो, तो `cos (theta + phi)` का मान ज्ञात कीजिए | (यदि `theta` तथा `phi` दोनों न्यूनकोण हैं)

लिखित उत्तर

Verified by Experts

The correct Answer is:
`rArr " "cos (theta + phi) = cos 90^(@) = 0`
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